A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow… (CVE-2026-15556)
A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow an attacker to forge a SAML response and auth as any principal with any roles on the protected application.
AI Analysis
Technical Summary
CVE-2026-15556 is a vulnerability in Picketlink's SP signature validation mechanism where a SAML response containing zero assertion elements matching the signature check can be forged by an attacker. This allows the attacker to authenticate as any principal with any roles on the protected application, effectively bypassing authentication controls. The vulnerability is classified under CWE-347 (Improper Verification of Cryptographic Signature) and has a CVSS v3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Red Hat JBoss Enterprise Application Platform 7.4 is affected, but version 8.x is not, as it does not include the vulnerable Picketlink components. Red Hat has issued an important security advisory (RHSA-2026:53644) with a patch in JBoss EAP 7.4.25 to fix this issue.
Potential Impact
An attacker with low privileges can exploit this vulnerability remotely over the network without user interaction to forge SAML responses and authenticate as any user with any roles on the affected application. This leads to a complete compromise of confidentiality and integrity of the application, allowing unauthorized access and potential unauthorized actions. Availability is not impacted. The vulnerability affects Red Hat JBoss Enterprise Application Platform 7.4 but not 8.x.
Mitigation Recommendations
A security update is available from Red Hat in JBoss Enterprise Application Platform 7.4.25 that fixes this vulnerability. Users should apply this official patch to remediate the issue. Red Hat JBoss EAP 8.x is not affected and requires no action. No other mitigations are specified by the vendor advisory.
A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow… (CVE-2026-15556)
Description
A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow an attacker to forge a SAML response and auth as any principal with any roles on the protected application.
CVSS v3.1
Score 8.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15556 is a vulnerability in Picketlink's SP signature validation mechanism where a SAML response containing zero assertion elements matching the signature check can be forged by an attacker. This allows the attacker to authenticate as any principal with any roles on the protected application, effectively bypassing authentication controls. The vulnerability is classified under CWE-347 (Improper Verification of Cryptographic Signature) and has a CVSS v3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Red Hat JBoss Enterprise Application Platform 7.4 is affected, but version 8.x is not, as it does not include the vulnerable Picketlink components. Red Hat has issued an important security advisory (RHSA-2026:53644) with a patch in JBoss EAP 7.4.25 to fix this issue.
Potential Impact
An attacker with low privileges can exploit this vulnerability remotely over the network without user interaction to forge SAML responses and authenticate as any user with any roles on the affected application. This leads to a complete compromise of confidentiality and integrity of the application, allowing unauthorized access and potential unauthorized actions. Availability is not impacted. The vulnerability affects Red Hat JBoss Enterprise Application Platform 7.4 but not 8.x.
Mitigation Recommendations
A security update is available from Red Hat in JBoss Enterprise Application Platform 7.4.25 that fixes this vulnerability. Users should apply this official patch to remediate the issue. Red Hat JBoss EAP 8.x is not affected and requires no action. No other mitigations are specified by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vw9v-mpfh-qwg3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-15556"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Patch Information
Threat ID: 6a7c9b72bf8831d539ce0811
Added to database: 08/12/2026, 16:12:34 UTC
Last enriched: 08/12/2026, 17:29:17 UTC
Last updated: 08/13/2026, 02:40:59 UTC
Views: 2
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