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CVE-2026-32245

Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a31ad347261f5a5196053f4e6084b12f2be1814c4186431a893c586a43d1502d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"tinyauth","vendor":"steveiliop56","versions":[{"status":"affected","version":"< 5.0.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89","tags":["x_refsource_MISC"],"url":"https://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/references/1
{"name":"https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3","tags":["x_refsource_MISC"],"url":"https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/references/2
{"name":"https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2d7587a19a76ebeea0924999aa5ca6940640f743e8c65f5e1472abfc372e7c54 · sha256:f8035c7abd722ce3… · /containers/cna/references/0

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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