CVE-2026-44793: OpenAM: Pre-authentication Reflected XSS in SAML2 Cluster Cookie-Hash-Redirect Path via `FSUtils.postToTarget`

Severity: high (CVSS 7.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-15 · updated 2026-09-23
Weakness: CWE-79

Description

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, certain federation endpoints in a non-default clustered configuration inconsistently encode user-supplied parameters rendered into HTML in the SAML2 cluster cookie-hash redirect path. An unauthenticated attacker can induce a user to follow a crafted request and execute script in the OpenAM origin. This issue is fixed in version 16.1.1.

Affected products

OpenIdentityPlatform OpenAM: before 16.1.1

References

https://github.com/OpenIdentityPlatform/OpenAM/commit/2f5e9bf4c28a4c9e97ded6ebd75e4e1ec241c894
https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1
https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-fhrq-3gmx-p879

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