What is CVE-2026-123539?

CVE-2026-123539 is a medium-severity vulnerability in Openidentityplatform Openam, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-11-08.

How severe is CVE-2026-123539?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Openidentityplatform Openam

CVE-2026-123539

OpenAM before 16.1.4 contains a stored cross-site scripting vulnerability that allows privileged attackers to inject script by placing markup in a user's display name. When the victim reaches the OAuth 2.0 / OpenID Connect consent page, the unencoded name executes script that can steal the OpenAM session cookie to impersonate the user.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openidentityplatform Openam

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

GitHub Security Advisory (GHSA-v6hq-3cfh-5gr6) (vendor-advisory)
VulnCheck Advisory: OpenAM before 16.1.4 Stored XSS via OAuth 2.0 Consent Page Display Name (third-party-advisory)

Frequently asked questions

What is CVE-2026-123539?: CVE-2026-123539 is a medium-severity vulnerability in Openidentityplatform Openam, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-11-08.
How severe is CVE-2026-123539?: Medium severity. CVSS v3 base score is 4.8 out of 10.