CVEvulnerability
CVE-2026-59099
9.3 CRITICAL
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-07-02
- Last modified
- 2026-10-25
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 9.3 CRITICAL — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-323
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.
Related
Weakness · CWE (1)
- CWE-323 Reusing a Nonce, Key Pair in Encryption weakness
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
- https://github.com/geo-chen/oss/blob/main/cas.md github.com
- https://www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure www.vulncheck.com