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CVE-2026-59099— Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure

Quick assessment

Affected
apereo cas
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apereo central authentication service是Apereo组织开源的一款单点登录认证服务系统。 Apereo Central Authentication Service 7.3.0版本至8.0.0-RC6之前版本存在加密问题漏洞，该漏洞源于AES-GCM初始化向量重用，可能导致远程未经身份验证的攻击者恢复明文会话状态。

CVSS 9.1 · Critical EPSS 0.55% · P46

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
apereo cas 7.3.0< 8.0.0-RC6 affected
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I. Basic Information for CVE-2026-59099

Vulnerability Information
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Vulnerability Title
Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5
Vulnerability Title
Apereo Central Authentication Service 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apereo central authentication service是Apereo组织开源的一款单点登录认证服务系统。 Apereo Central Authentication Service 7.3.0版本至8.0.0-RC6之前版本存在加密问题漏洞，该漏洞源于AES-GCM初始化向量重用，可能导致远程未经身份验证的攻击者恢复明文会话状态。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
apereo cas 7.3.0 ~ 8.0.0-RC6 -

II. Public POCs for CVE-2026-59099

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III. Intelligence Information for CVE-2026-59099

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Patches & Fixes for CVE-2026-59099 (1)

Vendor Advisories for CVE-2026-59099 (1)

Security Blog Posts for CVE-2026-59099 (1)

Vendor Pages for CVE-2026-59099 (1)

Other References for CVE-2026-59099 (1)

IV. Related Vulnerabilities

Same product: cas
Same vendor: apereo
Same weakness: CWE-323