Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-33544

Tinyauth is an authentication and authorization server. Prior to version 5.0.5, all three OAuth service implementations (GenericOAuthService, GithubOAuthService, GoogleOAuthService) store PKCE verifiers and access tokens as mutable struct fields on singleton instances shared across all concurrent requests. When two users initiate OAuth login for the same provider concurrently, a race condition between VerifyCode() and Userinfo() causes one user to receive a session with the other user's identity
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:618381eee2cfc1b4489d94d5e2c8b1a5aeb36189747230920396b8eb249fb400
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":"< 5.0.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803","tags":["x_refsource_MISC"],"url":"https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /containers/cna/references/1
{"name":"https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5","tags":["x_refsource_MISC"],"url":"https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /containers/cna/references/2
{"name":"https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92","tags":["x_refsource_CONFIRM"],"url":"https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d59ba841c0fb4eb047f806aa8977e087d887fe623aaa310494c53f501110b1ce · sha256:08d711be479f5297… · /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.

← Back to CVE Explorer