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CVE-2026-59099

CRITICAL
9.1
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-59099
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-02 15:38 UTC
Published
2026-07-02 19:42 UTC
Last updated
2026-07-02 19:42 UTC
Primary CWE
CWE-323
Reusing a Nonce, Key Pair in Encryption
Vendor / Product
apereo / cas
Sources
cve.org  ·  NVD

Severity & Metrics

9.1 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
apereo cas — 7.3.0 < 8.0.0-RC6
Weakness (CWE)
CWESourceDescription
CWE-323 cna Reusing a Nonce, Key Pair in Encryption
CVSS scores (2)
ScoreSeverityVersionSourceVector
9.3 CRITICAL 4.0 cna 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
9.1 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References (5)
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