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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-59099 ↗
- apereo.github.io/2026/06/18/vuln/ ↗
- github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0 ↗
- github.com/apereo/cas/releases/tag/v8.0.0-RC6 ↗
- github.com/geo-chen/oss/blob/main/cas.md ↗
- www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.