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CVE-2026-59099

Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure

Published: Jul 2, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-323
9.1CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 56.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-323

Affected Products

apereo
oss-projectaka cas, central authentication service, phpcas, opencast
casMixed
Cloud & SaaS / saas-application

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://apereo.github.io/2026/06/18/vuln/
apereo.github.io
https://github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0
github.com
https://github.com/apereo/cas/releases/tag/v8.0.0-RC6
github.com
and 2 more references View all →

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