CVE-2026-123550 json
OpenAM before 16.1.4 SAML Authentication Bypass via Unsigned Assertions
published 21d ago modified yesterday also EUVD-2026-119435 , GHSA-3j2f-qhrc-rjfj
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository OpenIdentityPlatform/OpenAM. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
OpenAM before 16.1.4 contains an authentication bypass vulnerability in its SAML v2.0 service provider that accepts unsigned assertions on the ECP (PAOS) and HTTP-Artifact bindings when WantAssertionsSigned is false. Unauthenticated remote attackers can submit forged assertions to obtain sessions as any mapped user, including administrators, and hijack single sign-on to dependent applications.
Patch / fix
- OpenIdentityPlatform OpenAM 16.1.4
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- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2d ago
Exploit prediction
0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- OpenIdentityPlatform OpenAM
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-3j2f-qhrc-rjfj
vendor-advisory, advisory
-
vulncheck.com
/advisories/openam-before-16.1.4-saml-authentication-bypass-via-unsigned-assertions
third-party-advisory
Sources
- CVE List CVE-2026-123550
- NVD CVE-2026-123550
- Maintainer advisory GHSA-3j2f-qhrc-rjfj
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of OpenIdentityPlatform/OpenAM published their own advisory on GitHub. Reviewed sources take precedence over it.