{"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": "2026-07-02T19:42:51.897Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-02T19:42:51.897Z"}, "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", "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"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.3.0,8.0.0-RC6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cas", "source": "cna", "vendor": "apereo"}, "product": "cas", "vendor": "apereo"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "central_authentication_service", "vendor": "apereo"}], "created": "2026-07-02T21:45:02.841069+00:00", "updated": "2026-07-02T21:45:02.841109+00:00", "vendors": ["apereo", "apereo$PRODUCT$cas", "apereo$PRODUCT$central_authentication_service"]}