CVE•Published 2026-07-02•1 article on news•7 live references•NVD data
CVE-2026-59099
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
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Weaknesses (CWE)
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.
Timeline
Published 2026-07-02
Modified 2026-07-02
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-59099Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-59099Censys host search filtered to this CVE id.
grep.app
CVE-2026-59099Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-59099GitHub code search for direct mentions.
Google dork
"CVE-2026-59099" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-59099 on GitHub.