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CVE-2026-59099 is a critical cryptographic vulnerability in Apereo CAS affecting versions 7.3.0 through 8.0.0-RC5 (fixed in 8.0.0-RC6). The flaw is caused by reuse of the AES-GCM initialization vector/nonce across the server lifetime: CAS used a fixed all-zero IV together with the same encryption key when encrypting client-side webflow execution tokens. Because the default CAS configuration stores authentication webflow state in the client browser, a remote unauthenticated attacker can obtain multiple encrypted tokens from the public login page and apply known-plaintext analysis to exploit keystream reuse. This allows recovery of plaintext webflow conversation state, exposing sensitive session, identity, and application state data. The issue is an information disclosure flaw rooted in improper nonce handling for authenticated encryption.
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A critical cryptographic vulnerability in Apereo CAS caused by AES-GCM nonce reuse via a fixed all-zero IV with the same encryption key, allowing unauthenticated remote attackers to decrypt webflow conversation state and expose sensitive session and identity data.
A critical cryptographic information disclosure vulnerability in Apereo CAS caused by AES-GCM IV/nonce reuse, allowing remote unauthenticated attackers to recover plaintext webflow conversation state from client-side tokens.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.