Common Weakness Enumeration
CWE-601
AllowedURL Redirection to Untrusted Site ('Open Redirect')
Abstraction: Base · Status: Draft
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
2401 vulnerabilities reference this CWE, most recent first.
CVE-2026-73671 (GCVE-0-2026-73671)
Vulnerability from cvelistv5 – Published: 2026-08-13 16:00 – Updated: 2026-08-14 16:52
VLAI
EPSS
VEX
Title
Saurus CMS Unauthenticated Open Redirect via logout url parameter
Summary
Saurus CMS Community Edition contains an unauthenticated open redirect vulnerability in the logout handling code in classes/port.inc.php, where the url parameter supplied via GET or POST is passed directly to the Location header without domain allowlist, scheme validation, or relative path enforcement. Attackers can craft a malicious logout URL containing an arbitrary external domain or javascript: URI scheme to redirect authenticated users to attacker-controlled phishing pages after session destruction, enabling credential theft and OAuth redirect abuse.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 16:49 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sauruscms/Saurus-CMS-Community… | product |
| https://github.com/DevVaibhav07/VULN-POC/blob/mai… | technical-description |
| https://www.vulncheck.com/advisories/saurus-cms-u… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Saurus | Saurus CMS Community Edition |
Affected:
0 , ≤ d886e5b
(custom)
|
Date Public
2026-08-13 00:00
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CVE-2026-73563 (GCVE-0-2026-73563)
Vulnerability from cvelistv5 – Published: 2026-08-13 17:32 – Updated: 2026-08-13 18:07
VLAI
EPSS
VEX
Title
Backstage: Unauthenticated OAuth account takeover via `redirect_uri` allowlist bypass in `@backstage/plugin-auth-backend`
Summary
Backstage is an open framework for building developer portals. Prior to 0.29.2, the experimental dynamic client registration and client ID metadata document features in the @backstage/plugin-auth-backend use full-string matcher.isMatch glob matching for auth.experimentalDynamicClientRegistration.allowedRedirectUriPatterns and the auth.experimentalClientIdMetadataDocuments allowedClientIdPatterns and allowedRedirectUriPatterns options. A hostname wildcard can match across URL component boundaries, allowing an attacker-controlled redirect URI with a trusted hostname suffix in its path to pass the allowlist and receive an OAuth authorization code after a victim completes the flow. Patterns without an explicit protocol can match unintended protocols, and redirect URIs containing embedded credentials are accepted after user information is stripped for matching. The features are experimental and disabled by default; only deployments that enable them and configure custom wildcard-hostname or protocol-less patterns are affected. This issue is first fixed in prerelease version 0.29.2.
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 18:07 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
1 reference
| URL | Tags |
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| https://github.com/backstage/backstage/security/a… | x_refsource_CONFIRM |
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CVE-2026-71240 (GCVE-0-2026-71240)
Vulnerability from cvelistv5 – Published: 2026-08-05 10:56 – Updated: 2026-08-10 11:45
VLAI
EPSS
VEX
Title
DjangoCRM - Unauthenticated Open Redirect via toggle_default_sorting next_url Parameter
Summary
DjangoCRM's toggle_default_sorting view is the only route in common/urls.py that is not wrapped in login_required or staff_member_required, and it redirects to a caller-supplied next_url GET parameter after only checking secure_url(next_url), which merely verifies the target host matches the current site's domain (blocking only cross-domain redirects) while allowing any same-site path with no authentication required to reach the view.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 12:57 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/DjangoCRM/django-crm | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DjangoCRM | django-crm |
Affected:
0
|
Date Public
2026-08-05 10:56
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CVE-2026-69087 (GCVE-0-2026-69087)
Vulnerability from cvelistv5 – Published: 2026-08-03 13:20 – Updated: 2026-08-03 14:25
VLAI
EPSS
VEX
Title
Grav Form Plugin before 9.1.13 Open Redirect via form.value() Twig
Summary
The Grav form plugin (getgrav/grav-plugin-form) before 9.1.13 contains an open redirect vulnerability. Since v9.1.11, the redirect process action evaluates user-supplied form data inside Twig expressions, and Grav::redirect() accepts external URLs without origin validation. When a form blueprint defines a redirect target such as redirect: "{{ form.value('next') }}" using an attacker-controllable field, an unauthenticated form submitter can supply a value like https://evil.com to cause a 302 redirect to an arbitrary external site, enabling phishing.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 14:25 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-form-pl… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| getgrav | grav-plugin-form |
Affected:
0 , < 9.1.13
(semver)
Unaffected: 9.1.13 (semver) |
Date Public
2026-07-21 00:00
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CVE-2026-67350 (GCVE-0-2026-67350)
Vulnerability from cvelistv5 – Published: 2026-07-31 14:19 – Updated: 2026-07-31 23:26 X_Open Source
VLAI
EPSS
VEX
Title
Serendipity < 2.6.1 Open Redirect via exit.php
Summary
Serendipity before 2.6.1 contains an open redirect vulnerability in exit.php that allows unauthenticated attackers to redirect users to arbitrary external sites by supplying a malicious Base64-encoded url parameter when the Track Exits plugin is configured with commentredirection set to s9y. Attackers can craft trusted-looking URLs leveraging the legitimate blog domain to conduct phishing, deliver malware, or bypass URL reputation filters.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 23:25 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/s9y/Serendipity/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/serendipity-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| s9y | Serendipity |
Affected:
0 , < 2.6.1
(semver)
Unaffected: 2.6.1 (semver) |
Date Public
2026-07-27 00:00
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CVE-2026-67178 (GCVE-0-2026-67178)
Vulnerability from cvelistv5 – Published: 2026-07-28 14:30 – Updated: 2026-07-28 14:44
VLAI
EPSS
VEX
Title
Open Redirect in MISP Installer-Generated Apache Configuration
Summary
MISP installation scripts generated an Apache HTTP virtual-host configuration containing an incorrectly formatted HTTP-to-HTTPS redirect:
Redirect permanent / https://misp.example
Apache’s Redirect directive appends any portion of the requested path that follows the matched prefix to the configured destination URL. Because the destination did not end with /, attacker-controlled path content was appended directly to the hostname rather than to its URL path.
For example, a request resembling:
http://misp.example/@attacker.example/
could result in a redirect resembling:
https://misp.example@attacker.example/
Under standard URL parsing, misp.example is interpreted as user information and attacker.example as the destination host. An unauthenticated remote attacker could therefore construct a URL hosted under the legitimate MISP domain that redirects users to an attacker-controlled website.
The vulnerability could be used for phishing, credential collection, or potentially disclosing sensitive query-string information preserved during the redirect. Exploitation requires a user to follow the crafted HTTP URL.
The fix adds the missing trailing slash to the redirect destination, ensuring that appended request data remains part of the path on the configured MISP host.
Existing installationsExisting MISP installations should review their Apache HTTP virtual-host configuration and ensure that the HTTPS redirect destination ends with a trailing slash:
Redirect permanent / https://misp.example/
After updating the configuration, validate it with apachectl configtest and reload or restart Apache for the change to take effect
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 14:43 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/15becd3b21245… | patch |
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CVE-2026-66829 (GCVE-0-2026-66829)
Vulnerability from cvelistv5 – Published: 2026-08-06 14:49 – Updated: 2026-08-06 15:42
VLAI
EPSS
VEX
Title
html_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirection
Summary
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a <meta http-equiv="refresh"> element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied <meta> elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.
This is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.
This issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:42 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/rrrene/html_sanitize_ex/securi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-66829.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-66829 | related |
| https://github.com/rrrene/html_sanitize_ex/commit… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| rrrene | html_sanitize_ex |
Affected:
0.3.1 , < 1.5.3
(semver)
cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:* |
|
| rrrene | html_sanitize_ex |
Affected:
8976d64ea0b77d26093a94a43ec48a3978e8d028 , < 9f7e38be51edc38f132dfe994f37af5cf5e0e76f
(git)
cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:* |
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CVE-2026-66773 (GCVE-0-2026-66773)
Vulnerability from cvelistv5 – Published: 2026-08-11 00:18 – Updated: 2026-08-11 14:27
VLAI
EPSS
VEX
Title
Server-controlled `__next` URL is not checking cross-origin
Summary
A malicious or compromised OData service could disclose sensitive authentication information and inject untrusted data into the application, which may leads to a high impact on confidentiality and low impact on integrity and no impact on Availability.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 13:11 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site
Assigner
References
2 references
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CVE-2026-66414 (GCVE-0-2026-66414)
Vulnerability from cvelistv5 – Published: 2026-07-30 16:36 – Updated: 2026-08-14 16:50
VLAI
EPSS
VEX
Title
Leantime Open Redirect in Login Controller via redirectUrl Parameter
Summary
Leantime 3.6.2 contains an open redirect vulnerability in the Login controller that allows unauthenticated attackers to redirect authenticated users to arbitrary external sites by manipulating the redirectUrl POST parameter. Attackers can craft a malicious login URL with a tampered redirectUrl value that bypasses FILTER_SANITIZE_URL validation to redirect victims to attacker-controlled sites for phishing or credential theft.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-30 17:40 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/Leantime/leantime/pull/3658 | issue-trackingpatch |
| https://github.com/javokhir-sec/CVE-PoC-Hub/secur… | vendor-advisory |
| https://github.com/Leantime/leantime | product |
| https://www.vulncheck.com/advisories/leantime-ope… | third-party-advisory |
Date Public
2026-07-30 00:00
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CVE-2026-66370 (GCVE-0-2026-66370)
Vulnerability from cvelistv5 – Published: 2026-08-06 14:49 – Updated: 2026-08-06 15:42
VLAI
EPSS
VEX
Title
html_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijacking
Summary
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an <input> element in sanitized HTML. HTML's form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form's action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.
No script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.
This issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:42 UTC
CWE
- CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/rrrene/html_sanitize_ex/securi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-66370.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-66370 | related |
| https://github.com/rrrene/html_sanitize_ex/commit… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| rrrene | html_sanitize_ex |
Affected:
0.3.1 , < 1.5.3
(semver)
cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:* |
|
| rrrene | html_sanitize_ex |
Affected:
8976d64ea0b77d26093a94a43ec48a3978e8d028 , < a1e804ed997e780ea71d14393cf2f701330553a6
(git)
cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:* |
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"product": "html_sanitize_ex",
"programFiles": [
"lib/html_sanitize_ex/scrubber/html5.ex",
"lib/html_sanitize_ex.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.HtmlSanitizeEx.Scrubber.HTML5\u0027:scrub_attribute/2"
},
{
"name": "\u0027Elixir.HtmlSanitizeEx.Scrubber.HTML5\u0027:sanitize/1"
},
{
"name": "\u0027Elixir.HtmlSanitizeEx\u0027:html5/1"
}
],
"repo": "https://github.com/rrrene/html_sanitize_ex",
"vendor": "rrrene",
"versions": [
{
"lessThan": "1.5.3",
"status": "affected",
"version": "0.3.1",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.HtmlSanitizeEx.Scrubber.HTML5",
"Elixir.HtmlSanitizeEx"
],
"packageName": "rrrene/html_sanitize_ex",
"packageURL": "pkg:github/rrrene/html_sanitize_ex",
"product": "html_sanitize_ex",
"programFiles": [
"lib/html_sanitize_ex/scrubber/html5.ex",
"lib/html_sanitize_ex.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.HtmlSanitizeEx.Scrubber.HTML5\u0027:scrub_attribute/2"
},
{
"name": "\u0027Elixir.HtmlSanitizeEx.Scrubber.HTML5\u0027:sanitize/1"
},
{
"name": "\u0027Elixir.HtmlSanitizeEx\u0027:html5/1"
}
],
"repo": "https://github.com/rrrene/html_sanitize_ex",
"vendor": "rrrene",
"versions": [
{
"lessThan": "a1e804ed997e780ea71d14393cf2f701330553a6",
"status": "affected",
"version": "8976d64ea0b77d26093a94a43ec48a3978e8d028",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eOnly \u003ccode\u003eHtmlSanitizeEx.html5/1\u003c/code\u003e, and custom scrubbers declared with \u003ccode\u003euse HtmlSanitizeEx, extend: :html5\u003c/code\u003e, allow the \u003ccode\u003einput\u003c/code\u003e element, and the sanitized output must be rendered to other users.\u003c/p\u003e\n\u003cp\u003eThe rendering page must also contain a form with an \u003ccode\u003eid\u003c/code\u003e, since that \u003ccode\u003eid\u003c/code\u003e is what the injected \u003ccode\u003eform\u003c/code\u003e attribute binds to.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Only `HtmlSanitizeEx.html5/1`, and custom scrubbers declared with `use HtmlSanitizeEx, extend: :html5`, allow the `input` element, and the sanitized output must be rendered to other users.\n\nThe rendering page must also contain a form with an `id`, since that `id` is what the injected `form` attribute binds to."
}
],
"value": "Only HtmlSanitizeEx.html5/1, and custom scrubbers declared with use HtmlSanitizeEx, extend: :html5, allow the input element, and the sanitized output must be rendered to other users.\n\nThe rendering page must also contain a form with an id, since that id is what the injected form attribute binds to."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.5.3",
"versionStartIncluding": "0.3.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Ren\u00e9 F\u00f6hring"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eURL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the \u003ccode\u003eform\u003c/code\u003e and \u003ccode\u003eformaction\u003c/code\u003e attributes on an \u003ccode\u003e\u0026lt;input\u0026gt;\u003c/code\u003e element in sanitized HTML. HTML\u0027s \u003ccode\u003eform\u003c/code\u003e attribute associates an input with any form on the page by its \u003ccode\u003eid\u003c/code\u003e even when the input sits outside that form, and \u003ccode\u003eformaction\u003c/code\u003e on a submit control overrides the owning form\u0027s \u003ccode\u003eaction\u003c/code\u003e. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\u003c/p\u003e\n\u003cp\u003eNo script executes. The scrubber allows neither \u003ccode\u003eform\u003c/code\u003e nor \u003ccode\u003ebutton\u003c/code\u003e, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an \u003ccode\u003eid\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the `form` and `formaction` attributes on an `\u003cinput\u003e` element in sanitized HTML. HTML\u0027s `form` attribute associates an input with any form on the page by its `id` even when the input sits outside that form, and `formaction` on a submit control overrides the owning form\u0027s `action`. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither `form` nor `button`, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an `id`.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3."
}
],
"value": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027) vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an \u003cinput\u003e element in sanitized HTML. HTML\u0027s form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form\u0027s action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3."
}
],
"impacts": [
{
"capecId": "CAPEC-154",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-154 Resource Location Spoofing"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "LOW",
"userInteraction": "ACTIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-601",
"description": "CWE-601 URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-06T14:49:15.841Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-w3f9-jjhw-wwvq"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-66370.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66370"
},
{
"tags": [
"patch"
],
"url": "https://github.com/rrrene/html_sanitize_ex/commit/a1e804ed997e780ea71d14393cf2f701330553a6"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "html_sanitize_ex HTML5 scrubber keeps attacker-supplied form-association attributes, allowing form hijacking",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eSanitize with \u003ccode\u003ebasic_html/1\u003c/code\u003e, \u003ccode\u003emarkdown_html/1\u003c/code\u003e or \u003ccode\u003estrip_tags/1\u003c/code\u003e, none of which allow \u003ccode\u003einput\u003c/code\u003e, or define a custom scrubber that omits it.\u003c/p\u003e\n\u003cp\u003eOmitting the \u003ccode\u003eid\u003c/code\u003e attribute from the page\u0027s own forms, or giving them values an attacker cannot predict, removes the anchor the injected \u003ccode\u003eform\u003c/code\u003e attribute needs.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which allow `input`, or define a custom scrubber that omits it.\n\nOmitting the `id` attribute from the page\u0027s own forms, or giving them values an attacker cannot predict, removes the anchor the injected `form` attribute needs."
}
],
"value": "Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which allow input, or define a custom scrubber that omits it.\n\nOmitting the id attribute from the page\u0027s own forms, or giving them values an attacker cannot predict, removes the anchor the injected form attribute needs."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-66370",
"datePublished": "2026-08-06T14:49:15.841Z",
"dateReserved": "2026-08-06T10:15:01.808Z",
"dateUpdated": "2026-08-06T15:42:09.603Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation MIT-5
Implementation
Strategy: Input Validation
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- Use a list of approved URLs or domains to be used for redirection.
Mitigation
Architecture and Design
Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
Mitigation MIT-21.2
Architecture and Design
Strategy: Enforcement by Conversion
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- For example, ID 1 could map to "/login.asp" and ID 2 could map to "http://www.example.com/". Features such as the ESAPI AccessReferenceMap [REF-45] provide this capability.
Mitigation
Architecture and Design
Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application [REF-483]. Be sure that the nonce is not predictable (CWE-330).
Mitigation MIT-6
Architecture and Design
Implementation
Strategy: Attack Surface Reduction
- Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
- Many open redirect problems occur because the programmer assumed that certain inputs could not be modified, such as cookies and hidden form fields.
Mitigation MIT-29
Operation
Strategy: Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
CAPEC-178: Cross-Site Flashing
An attacker is able to trick the victim into executing a Flash document that passes commands or calls to a Flash player browser plugin, allowing the attacker to exploit native Flash functionality in the client browser. This attack pattern occurs where an attacker can provide a crafted link to a Flash document (SWF file) which, when followed, will cause additional malicious instructions to be executed. The attacker does not need to serve or control the Flash document. The attack takes advantage of the fact that Flash files can reference external URLs. If variables that serve as URLs that the Flash application references can be controlled through parameters, then by creating a link that includes values for those parameters, an attacker can cause arbitrary content to be referenced and possibly executed by the targeted Flash application.