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TI-2026-42279 Aliases CVE-2026-59099GHSA-phqw-pwxm-86gq

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

Priority HIGH 81CWE-323Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00548 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed cas (apereo): 8.0.0-RC6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Apereocas7.3.0 to before 8.0.0-RC68.0.0-RC6Patch availableCNA
  • cas VendorApereo Affected 7.3.0 to before 8.0.0-RC6 Fixed in 8.0.0-RC6 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*——Apereo
  • cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:* Versions — — ·Apereo

Remediation

  • Fix · CNA cas (apereo) Fixed in 8.0.0-RC6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59099
  2. 2026-10-03 Alias added: GHSA-phqw-pwxm-86gq

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2026-25433 Xerte Online Toolkits <= 3.14 Unauthenticated Template Import Arbitrary File Upload Leading to Remote Code Execution CVSS 4.0CRITICAL 9.3
  • TI-2023-13363 LDAP password leak in Apereo CAS - GHSL-2023-009 CVSS 3.1HIGH 7.5
  • TI-2024-10382 Apereo CAS login session expiration CVSS 4.0MEDIUM 6.3
  • TI-2024-10383 Apereo CAS 2FA login improper authentication CVSS 4.0MEDIUM 5.3
  • TI-2024-10381 Apereo CAS login redirect CVSS 4.0MEDIUM 5.3
  • TI-2024-04097 CAS <= 1.0.0 - Unauthenticated SSRF CVSS 3.1CRITICAL 9.1
See all 47 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences