CWE-87
Improper Neutralization of Alternate XSS Syntax
The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.
CVE-2026-22711 (GCVE-0-2026-22711)
Vulnerability from cvelistv5 – Published: 2026-04-07 18:39 – Updated: 2026-04-08 22:02
VLAI
Title
Stored XSS through system messages in WikiLove
Summary
Improper neutralization of alternate XSS syntax vulnerability in The Wikimedia Foundation Mediawiki - Wikilove Extension allows Cross-Site Scripting (XSS).The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Severity
CWE
- CWE-87 - Improper neutralization of alternate XSS syntax
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Wikimedia Foundation | Mediawiki - Wikilove Extension |
Unaffected:
1.43
Unaffected: 1.44 Unaffected: 1.45 Affected: 0 , < 1.43 (custom) |
Credits
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CVE-2026-27120 (GCVE-0-2026-27120)
Vulnerability from cvelistv5 – Published: 2026-02-20 21:27 – Updated: 2026-02-24 18:41
VLAI
Title
Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster
Summary
Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.
Severity
6.1 (Medium)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/vapor/leaf-kit/security/adviso… | x_refsource_CONFIRM |
| https://github.com/vapor/leaf-kit/commit/8919e394… | x_refsource_MISC |
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CVE-2026-33506 (GCVE-0-2026-33506)
Vulnerability from cvelistv5 – Published: 2026-03-26 18:48 – Updated: 2026-03-26 19:52
VLAI
Title
DOM-Based XSS in Ory Polis Login Page
Summary
Ory Polis, formerly known as BoxyHQ Jackson, bridges or proxies a SAML login flow to OAuth 2.0 or OpenID Connect. Versions prior to 26.2.0 contain a DOM-based Cross-Site Scripting (XSS) vulnerability in Ory Polis's login functionality. The application improperly trusts a URL parameter (`callbackUrl`), which is passed to `router.push`. An attacker can craft a malicious link that, when opened by an authenticated user (or an unauthenticated user that later logs in), performs a client-side redirect and executes arbitrary JavaScript in the context of their browser. This could lead to credential theft, internal network pivoting, and unauthorized actions performed on behalf of the victim. Version 26.2.0 contains a patch for the issue.
Severity
8.8 (High)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ory/polis/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/ory/polis/releases/tag/v26.2.0 | x_refsource_MISC |
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CVE-2026-33510 (GCVE-0-2026-33510)
Vulnerability from cvelistv5 – Published: 2026-04-06 14:51 – Updated: 2026-04-06 15:41
VLAI
Title
DOM-Based XSS in Homarr /auth/login Redirect
Summary
Homarr is an open-source dashboard. Prior to 1.57.0, a DOM-based Cross-Site Scripting (XSS) vulnerability has been discovered in Homarr's /auth/login page. The application improperly trusts a URL parameter (callbackUrl), which is passed to redirect and router.push. An attacker can craft a malicious link that, when opened by an authenticated user, performs a client-side redirect and executes arbitrary JavaScript in the context of their browser. This could lead to credential theft, internal network pivoting, and unauthorized actions performed on behalf of the victim. This vulnerability is fixed in 1.57.0.
Severity
8.8 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/homarr-labs/homarr/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| homarr-labs | homarr |
Affected:
< 1.57.0
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CVE-2026-34598 (GCVE-0-2026-34598)
Vulnerability from cvelistv5 – Published: 2026-04-02 17:37 – Updated: 2026-04-02 19:09
VLAI
Title
YesWiki has Persistant Blind XSS at "/?BazaR&vue=consulter"
Summary
YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.
Severity
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/YesWiki/yeswiki/security/advis… | x_refsource_CONFIRM |
| https://github.com/YesWiki/yeswiki/releases/tag/v4.6.0 | x_refsource_MISC |
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CVE-2026-35534 (GCVE-0-2026-35534)
Vulnerability from cvelistv5 – Published: 2026-04-07 15:47 – Updated: 2026-04-09 16:19
VLAI
Title
ChurchCRM has Stored XSS in PersonView.php via Facebook Field Attribute Injection
Summary
ChurchCRM is an open-source church management system. Prior to 7.1.0, a stored cross-site scripting vulnerability exists in PersonView.php due to incorrect use of sanitizeText() as an output sanitizer for HTML attribute context. The function only strips HTML tags, it does not escape quote characters allowing an attacker to break out of the href attribute and inject arbitrary JavaScript event handlers. Any authenticated user with the EditRecords role can store the payload in a person's Facebook field. The XSS fires against any user who views that person's profile page, including administrators, enabling session hijacking and full account takeover. This vulnerability is fixed in 7.1.0.
Severity
7.6 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/ChurchCRM/CRM/security/advisor… | x_refsource_CONFIRM |
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CVE-2026-40321 (GCVE-0-2026-40321)
Vulnerability from cvelistv5 – Published: 2026-04-17 21:10 – Updated: 2026-04-22 03:55
VLAI
Title
DotNetNuke.Core has stored cross-site-scripting (XSS) via SVG upload
Summary
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.2.2, a user could upload a specially crafted SVG file that could include scripts that can target both authenticated and unauthenticated DNN users. The impact is increased if the scripts are run by a power user. Version 10.2.2 patches the issue.
Severity
8.1 (High)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/dnnsoftware/Dnn.Platform/secur… | x_refsource_CONFIRM |
| https://github.com/dnnsoftware/Dnn.Platform/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| dnnsoftware | Dnn.Platform |
Affected:
< 10.2.2
|
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CVE-2026-42235 (GCVE-0-2026-42235)
Vulnerability from cvelistv5 – Published: 2026-05-04 18:38 – Updated: 2026-05-05 14:40
VLAI
Title
n8n: XSS via MCP OAuth client
Summary
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n browser session, enabling credential and session token theft, workflow manipulation, or privilege escalation. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Severity
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories… | x_refsource_CONFIRM |
Impacted products
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CVE-2026-42458 (GCVE-0-2026-42458)
Vulnerability from cvelistv5 – Published: 2026-05-15 17:02 – Updated: 2026-05-15 18:04
VLAI
Title
Magento LTS: Reflected XSS - Import -> Data Flow (profiles)
Summary
Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, there is a reflected XSS vulnerability under admin panel -> System -> Import/Export -> Dataflow - Profiles. This vulnerability is fixed in 20.18.0.
Severity
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OpenMage/magento-lts/security/… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenMage | magento-lts |
Affected:
< 20.18.0
|
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CVE-2026-45314 (GCVE-0-2026-45314)
Vulnerability from cvelistv5 – Published: 2026-05-15 21:31 – Updated: 2026-05-18 19:44
VLAI
Title
Open WebUI: XSS via SVG in /api/v1/channels/webhooks/{webhook_id}/profile/image
Summary
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the channel webhook create/update flow accepts arbitrary profile_image_url values, including data:image/svg+xml;base64,... payloads. The profile image endpoint then decodes and serves this SVG as image/svg+xml without sanitization, allowing attacker-controlled script handlers (for example onload) to execute when the profile-image URL is opened in the browser. This vulnerability is fixed in 0.9.3.
Severity
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-webui/open-webui/security… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-webui | open-webui |
Affected:
< 0.9.3
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-45314",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-18T19:43:05.967674Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-18T19:44:49.427Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-3856-3vxq-m6fc"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "open-webui",
"vendor": "open-webui",
"versions": [
{
"status": "affected",
"version": "\u003c 0.9.3"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the channel webhook create/update flow accepts arbitrary profile_image_url values, including data:image/svg+xml;base64,... payloads. The profile image endpoint then decodes and serves this SVG as image/svg+xml without sanitization, allowing attacker-controlled script handlers (for example onload) to execute when the profile-image URL is opened in the browser. This vulnerability is fixed in 0.9.3."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-87",
"description": "CWE-87: Improper Neutralization of Alternate XSS Syntax",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-15T21:31:24.526Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/open-webui/open-webui/security/advisories/GHSA-3856-3vxq-m6fc",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-3856-3vxq-m6fc"
}
],
"source": {
"advisory": "GHSA-3856-3vxq-m6fc",
"discovery": "UNKNOWN"
},
"title": "Open WebUI: XSS via SVG in /api/v1/channels/webhooks/{webhook_id}/profile/image"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45314",
"datePublished": "2026-05-15T21:31:24.526Z",
"dateReserved": "2026-05-11T20:50:30.538Z",
"dateUpdated": "2026-05-18T19:44:49.427Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Phase: Implementation
Description:
- Resolve all input to absolute or canonical representations before processing.
Mitigation
Phase: Implementation
Description:
- Carefully check each input parameter against a rigorous positive specification (allowlist) defining the specific characters and format allowed. All input should be neutralized, not just parameters that the user is supposed to specify, but all data in the request, including tag attributes, hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. We often encounter data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended.
Mitigation ID: MIT-30.1
Phase: Implementation
Strategy: Output Encoding
Description:
- Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
- The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
Mitigation ID: MIT-43
Phase: Implementation
Description:
- With Struts, write all data from form beans with the bean's filter attribute set to true.
Mitigation ID: MIT-31
Phase: Implementation
Strategy: Attack Surface Reduction
Description:
- To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.
CAPEC-199: XSS Using Alternate Syntax
An adversary uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.