What is CVE-2026-123551?

CVE-2026-123551 is a critical-severity vulnerability in Openidentityplatform Openam, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 10.0/10. Published 2026-11-08.

How severe is CVE-2026-123551?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Openidentityplatform Openam

CVE-2026-123551

OpenAM from 14.0.0 before 16.1.4 contains an information disclosure vulnerability that allows unauthenticated attackers to read live session tokens from the notification WebSocket. Attackers can bypass the agent-only check through an unvalidated internal forward on legacy Liberty ID-FF endpoints, collecting iPlanetDirectoryPro tokens to hijack user and administrator sessions.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

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-201 — Insertion of Sensitive Information into Sent Data

References

github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-5c3q-hp86-xjr8 (vendor-advisory)
www.vulncheck.com/advisories/openam-14.0.0-before-16.1.4-session-token-disclosu… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123551?: CVE-2026-123551 is a critical-severity vulnerability in Openidentityplatform Openam, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 10.0/10. Published 2026-11-08.
How severe is CVE-2026-123551?: Critical severity. CVSS v3 base score is 10.0 out of 10.