CVE-2026-59099

CriticalCVSS 9.1/10Last modified Oct 25, 2026

Description

Apereo CAS 7.3.0 before 8.0.0-RC6 contains a cryptographic vulnerability that allows remote unauthenticated attackers to recover plaintext conversation state by exploiting AES-GCM initialization vector reuse across the server lifetime. Attackers can collect multiple client-side webflow execution tokens from the unauthenticated login page and perform known-plaintext analysis to decrypt the webflow conversation state due to keystream reuse caused by a fixed all-zero IV paired with the same encryption key.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-323

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
apereocas>= 7.3.0, < 8.0.0-RC6

References

Timeline

Published
Jul 2, 2026
Last modified
Oct 25, 2026
NVD status
Awaiting Analysis

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