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CVE

CVE-2026-59099

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

CVE-2026-59099

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://apereo.github.io/2026/06/18/vuln/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59099.json, https://github.com/apereo/cas/releases/tag/v8.0.0-RC6, https://nvd.nist.gov/vuln/detail/CVE-2026-59099, https://www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure, https://github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0, https://github.com/apereo/cas, https://github.com/geo-chen/oss/blob/main/cas.md

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00356%
EPSS Percentile
0.2894%
Introduced Version
7eaf9bbefb8acc431e8fe2da1d3692eb16dee60b
Fix Available
22c6f4adf738852782309b523b4e80371057f2d0

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