CVE-2026-59099

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Source
https://cve.org/CVERecord?id=CVE-2026-59099
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59099.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59099
Published
2026-07-02T19:42:51Z
Modified
2026-10-28T02:30:30Z
Severity
  • 9.3 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure
Details

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.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-323"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59099.json"
}
References

Affected packages

Git / github.com/apereo/cas

Affected ranges

Type
GIT
Repo
https://github.com/apereo/cas
Events
Introduced
7eaf9bbefb8acc431e8fe2da1d3692eb16dee60b
Fixed
3ed874463a24f2a2dc130015ebb4ecd0540f7ef9
Fixed
22c6f4adf738852782309b523b4e80371057f2d0
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "7.3.0"
                },
                {
                    "fixed":  "8.0.0-RC6"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "22c6f4adf738852782309b523b4e80371057f2d0"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59099.json"