CVE-2026-8368 (GCVE-0-2026-8368)
Vulnerability from cvelistv5 – Published: 2026-05-12 14:01 – Updated: 2026-05-19 17:16
VLAI
EPSS
VEX
Title
LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects
Summary
LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.
On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.
A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 14:30 UTC
CWE
- CWE-522 - Insufficiently Protected Credentials
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| OALDERS | LWP::UserAgent |
Affected:
0 , < 6.83
(custom)
|
guessed |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-05-12T17:41:03.656Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/05/12/7"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-8368",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:30:39.897128Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-19T17:16:03.676Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://cpan.org/modules",
"defaultStatus": "unaffected",
"packageName": "libwww-perl",
"product": "LWP::UserAgent",
"programFiles": [
"lib/LWP/UserAgent.pm"
],
"programRoutines": [
{
"name": "LWP::UserAgent::request"
}
],
"repo": "https://github.com/libwww-perl/libwww-perl",
"vendor": "OALDERS",
"versions": [
{
"lessThan": "6.83",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Kai Aizen"
}
],
"descriptions": [
{
"lang": "en",
"value": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.\n\nOn a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.\n\nA redirect to an attacker controlled host therefore discloses the caller\u0027s credentials to that host."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-522",
"description": "CWE-522 Insufficiently Protected Credentials",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-12T14:01:25.365Z",
"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"shortName": "CPANSec"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch"
},
{
"tags": [
"release-notes"
],
"url": "https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/libwww-perl/libwww-perl/pull/512"
},
{
"tags": [
"related"
],
"url": "https://github.com/libwww-perl/libwww-perl/pull/284"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to libwww-perl 6.83 or later."
}
],
"source": {
"discovery": "UNKNOWN"
},
"timeline": [
{
"lang": "en",
"time": "2026-05-11T00:00:00.000Z",
"value": "Issue reported."
},
{
"lang": "en",
"time": "2026-05-12T00:00:00.000Z",
"value": "libwww-perl 6.83 released with fix."
}
],
"title": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects",
"x_generator": {
"engine": "cpansec-cna-tool 0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"assignerShortName": "CPANSec",
"cveId": "CVE-2026-8368",
"datePublished": "2026-05-12T14:01:25.365Z",
"dateReserved": "2026-05-11T21:33:14.480Z",
"dateUpdated": "2026-05-19T17:16:03.676Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-8368",
"date": "2026-09-21",
"epss": "0.00266",
"percentile": "0.18771"
},
"microsoft_vex": {
"current_release_date": "2026-06-03T01:41:56.000Z",
"cve": "CVE-2026-8368",
"id": "msrc_CVE-2026-8368",
"initial_release_date": "2026-05-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-8368.json",
"version": "3"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://cpan.org/modules",
"defaultStatus": "unaffected",
"packageName": "libwww-perl",
"product": "LWP::UserAgent",
"programFiles": [
"lib/LWP/UserAgent.pm"
],
"programRoutines": [
{
"name": "LWP::UserAgent::request"
}
],
"repo": "https://github.com/libwww-perl/libwww-perl",
"vendor": "OALDERS",
"versions": [
{
"lessThan": "6.83",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.\n\nOn a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.\n\nA redirect to an attacker controlled host therefore discloses the caller\u0027s credentials to that host."
}
],
"id": "CVE-2026-8368",
"lastModified": "2026-06-17T11:03:51.480",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-8368",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:30:39.897128Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-12T15:16:19.690",
"references": [
{
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"url": "https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch"
},
{
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"url": "https://github.com/libwww-perl/libwww-perl/pull/284"
},
{
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"url": "https://github.com/libwww-perl/libwww-perl/pull/512"
},
{
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"url": "https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/05/12/7"
}
],
"sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-522"
}
],
"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:46:44+00:00",
"cve": "CVE-2026-8368",
"id": "CVE-2026-8368",
"initial_release_date": "2026-05-12T14:01:25.365000+00:00",
"product_status:known_affected": "4",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "perl-libwww-perl: perl-libwww-perl: Information disclosure via cross-origin redirects",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8368.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-05-12T17:41:03.656Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/05/12/7"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-8368",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:30:39.897128Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-13T14:31:48.984Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://cpan.org/modules",
"defaultStatus": "unaffected",
"packageName": "libwww-perl",
"product": "LWP::UserAgent",
"programFiles": [
"lib/LWP/UserAgent.pm"
],
"programRoutines": [
{
"name": "LWP::UserAgent::request"
}
],
"repo": "https://github.com/libwww-perl/libwww-perl",
"vendor": "OALDERS",
"versions": [
{
"lessThan": "6.83",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Kai Aizen"
}
],
"descriptions": [
{
"lang": "en",
"value": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.\n\nOn a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.\n\nA redirect to an attacker controlled host therefore discloses the caller\u0027s credentials to that host."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-522",
"description": "CWE-522 Insufficiently Protected Credentials",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-12T14:01:25.365Z",
"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"shortName": "CPANSec"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch"
},
{
"tags": [
"release-notes"
],
"url": "https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/libwww-perl/libwww-perl/pull/512"
},
{
"tags": [
"related"
],
"url": "https://github.com/libwww-perl/libwww-perl/pull/284"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to libwww-perl 6.83 or later."
}
],
"source": {
"discovery": "UNKNOWN"
},
"timeline": [
{
"lang": "en",
"time": "2026-05-11T00:00:00.000Z",
"value": "Issue reported."
},
{
"lang": "en",
"time": "2026-05-12T00:00:00.000Z",
"value": "libwww-perl 6.83 released with fix."
}
],
"title": "LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects",
"x_generator": {
"engine": "cpansec-cna-tool 0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"assignerShortName": "CPANSec",
"cveId": "CVE-2026-8368",
"datePublished": "2026-05-12T14:01:25.365Z",
"dateReserved": "2026-05-11T21:33:14.480Z",
"dateUpdated": "2026-05-19T17:16:03.676Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…