CVE WatchJul 14, 2026

CVE-2026-59099

Apereo CAS 7.3.0 before 8.0.0-RC6 contains a cryptographic vulnerability that allows remote unauthenticated attackers to recover plaintext c

CVSS

9.1

Critical

EPSS

0.4%

p28

KEV

—

Exploit Today

0-100

Published: Jul 2, 2026 · Last modified: Jul 14, 2026 · CWE-323

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-07-032026-07-16

Technical 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.

Official references

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