CVE-2026-123540

LOW 2.0

OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST

CVSS Score

2.0

EPSS Score

0.0%

EPSS Percentile

0th

OpenAM before 16.1.4 contains an incomplete output encoding vulnerability that allows a SAML 1.x identity provider to alter attribute values by injecting unencoded content into the service provider auto-submitted form. Attackers controlling a trusted identity provider can craft assertion attribute names or values that reach the target application in modified form, undermining the integrity of received attributes.

CWE	CWE-116
Vendor	openidentityplatform
Product	openam
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

OpenIdentityPlatform / OpenAM

0 < 16.1.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-pw99-8h4m-p3gm vulncheck.com: https://www.vulncheck.com/advisories/openam-before-16.1.4-incomplete-attribute-encoding-in-saml-1-x-form-post

Credits

🔍 qurb4n01 vharseko maximthomas tsujiguchitky