Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.3epss 0.4%
exploitation probability
0.4%top 72% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
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
Affected products
apereo · caspublic PoCs found — 1
cve_referencegithub.com/geo-chen/oss/blob/main/cas.mdunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://apereo.github.io/2026/06/18/vuln/https://github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0https://github.com/apereo/cas/releases/tag/v8.0.0-RC6https://github.com/geo-chen/oss/blob/main/cas.mdhttps://www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure