{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-59099", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-07-02T15:38:18.929Z", "datePublished": "2026-07-02T19:42:51.897Z", "dateUpdated": "2026-07-14T22:03:25.158Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-14T22:03:25.158Z" }, "title": "Apereo CAS 7.3.0 < 8.0.0-RC6 - AES-GCM Nonce Reuse Information Disclosure", "descriptions": [ { "lang": "en", "value": "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." } ], "tags": [ "x_open-source" ], "datePublic": "2026-06-18T00:00:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-323", "description": "Reusing a Nonce, Key Pair in Encryption", "type": "CWE" } ] } ], "affected": [ { "vendor": "apereo", "product": "cas", "defaultStatus": "unaffected", "packageURL": "pkg:github/apereo/cas", "versions": [ { "version": "7.3.0", "status": "affected", "versionType": "custom", "lessThan": "8.0.0-RC6" } ], "repo": "https://github.com/apereo/cas" } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.3.0", "versionEndExcluding": "8.0.0-RC6" } ] } ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "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" } } ], "references": [ { "url": "https://apereo.github.io/2026/06/18/vuln/", "name": "Maintainer Advisory", "tags": [ "vendor-advisory" ] }, { "url": "https://github.com/apereo/cas/releases/tag/v8.0.0-RC6", "name": "Release Notes", "tags": [ "release-notes" ] }, { "url": "https://github.com/geo-chen/oss/blob/main/cas.md", "name": "Researcher Disclosure", "tags": [ "technical-description", "exploit" ] }, { "url": "https://github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0", "name": "Fix Commit", "tags": [ "patch" ] }, { "url": "https://www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure", "tags": [ "third-party-advisory" ] } ], "credits": [ { "lang": "en", "value": "George Chen", "type": "finder" } ], "x_generator": { "engine": "vulncheck-endgame" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-07-06T12:29:20.364889Z", "id": "CVE-2026-59099", "options": [ { "Exploitation": "poc" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-06T12:30:35.548Z" } } ] } }