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CVE-2026-59099

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 encrypt
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:923bc7f8a1f77d60447a23fe330802163c1d3b5c3703d54850d22c94355789fa
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:github/apereo/cas","product":"cas","repo":"https://github.com/apereo/cas","vendor":"apereo","versions":[{"lessThan":"8.0.0-RC6","status":"affected","version":"7.3.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-323","description":"Reusing a Nonce, Key Pair in Encryption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"Maintainer Advisory","tags":["vendor-advisory"],"url":"https://apereo.github.io/2026/06/18/vuln/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/references/0
{"name":"Fix Commit","tags":["patch"],"url":"https://github.com/apereo/cas/commit/22c6f4adf738852782309b523b4e80371057f2d0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/references/3
{"name":"Release Notes","tags":["release-notes"],"url":"https://github.com/apereo/cas/releases/tag/v8.0.0-RC6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/references/1
{"name":"Researcher Disclosure","tags":["technical-description","exploit"],"url":"https://github.com/geo-chen/oss/blob/main/cas.md"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/references/2
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/apereo-cas-rc6-aes-gcm-nonce-reuse-information-disclosure"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5f3fa83abec105b98b8e04d2159bcb97c3b925a52d4d9128d29ea6c66a154e1 · sha256:25efd3f0e4e513cc… · /containers/cna/references/4

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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