CVE-2026-33544

HIGHNVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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. This issue has been patched in version 5.0.5.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
26.3%
KEV
Not listed

Published

April 2, 2026

Last Modified

April 7, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github Patch Available🟡 PoC Available

OAuth account confusion via shared mutable state on singleton service instances · Advisory · tinyauthapp/tinyauth · GitHub

https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-9q5m-jfc4-wc92
github_release Patch Available

v5.0.5

Patch available: steveiliop56/tinyauth v5.0.5

https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.5
github_commit Patch Available

commit f26c2171610d (steveiliop56/tinyauth)

Patch available: steveiliop56/tinyauth v5.0.5-beta.2 (contains commit f26c2171610d)

https://github.com/steveiliop56/tinyauth/commit/f26c2171610d5c2dfbba2edb6ccd39490e349803

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/steveiliop56/tinyauth—1.0.1-0.20260401140714-fc1d4f2082a5—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-25 14:18 UTCEPSS rescore
  2. 2026-07-25 14:18 UTCEPSS rescore
  3. 2026-07-24 14:17 UTCEPSS rescore
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  5. 2026-07-23 14:18 UTCEPSS rescore
  6. 2026-07-23 14:18 UTCEPSS rescore
  7. 2026-07-23 03:09 UTCEG score recompute
  8. 2026-07-22 14:08 UTCEPSS rescore
  9. 2026-07-20 17:08 UTCEPSS rescore
  10. 2026-07-19 14:31 UTCEPSS rescore
  11. 2026-07-19 02:29 UTCEPSS rescore
  12. 2026-07-18 10:04 UTCEPSS rescore
  13. 2026-07-17 03:54 UTCOSV refresh
  14. 2026-07-16 17:03 UTCEPSS rescore
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  25. 2026-07-07 13:46 UTCEPSS rescore
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  1. 2026-07-06 16:27 UTCEPSS rescore
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  5. 2026-07-05 02:30 UTCEPSS rescore
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  7. 2026-07-01 15:06 UTCEPSS rescore
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-28 14:07 UTCEPSS rescore
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  11. 2026-06-28 04:56 UTCEPSS rescore
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  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-25 13:49 UTCEPSS rescore
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  16. 2026-06-24 14:05 UTCEPSS rescore
  17. 2026-06-23 21:33 UTCEPSS rescore
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  19. 2026-06-22 14:25 UTCEPSS rescore
  20. 2026-06-22 14:25 UTCEPSS rescore
  21. 2026-06-21 14:56 UTCEPSS rescore
  22. 2026-06-21 14:56 UTCEPSS rescore
  23. 2026-06-21 01:59 UTCEPSS rescore
  24. 2026-06-19 19:25 UTCEPSS rescore
  25. 2026-06-19 19:25 UTCEPSS rescore
  26. 2026-06-18 17:52 UTCEPSS rescore
  27. 2026-06-18 17:52 UTCEPSS rescore
  28. 2026-06-17 17:53 UTCEPSS rescore
  29. 2026-06-16 17:52 UTCEPSS rescore
  30. 2026-06-15 17:49 UTCEPSS rescore
  31. 2026-06-14 23:18 UTCEPSS rescore
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  35. 2026-06-11 14:00 UTCEPSS rescore
  36. 2026-06-10 22:18 UTCEPSS rescore
  37. 2026-06-10 13:22 UTCEPSS rescore
  38. 2026-06-08 14:17 UTCEPSS rescore
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  40. 2026-06-07 15:25 UTCEPSS rescore
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  43. 2026-06-06 13:47 UTCEPSS rescore
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  45. 2026-06-05 22:47 UTCEPSS rescore
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  47. 2026-06-05 06:10 UTCEPSS rescore
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  49. 2026-06-04 13:12 UTCEPSS rescore
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  51. 2026-06-02 20:13 UTCEPSS rescore
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  55. 2026-05-31 22:30 UTCEPSS rescore
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  57. 2026-05-31 00:16 UTCEPSS rescore
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  60. 2026-05-29 13:44 UTCEPSS rescore
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  62. 2026-05-28 13:44 UTCEPSS rescore
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  65. 2026-05-27 13:40 UTCEPSS rescore
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  68. 2026-05-26 13:44 UTCEPSS rescore
  69. 2026-05-26 07:18 UTCEPSS rescore
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  71. 2026-05-20 22:38 UTCEPSS rescore
  72. 2026-05-20 22:38 UTCEPSS rescore
  73. 2026-05-20 19:27 UTCEG score recompute
  74. 2026-05-20 11:22 UTCEPSS rescore
  75. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-33544?
CVE-2026-33544 is a high vulnerability published on April 2, 2026. 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…
When was CVE-2026-33544 disclosed?
CVE-2026-33544 was first published in the National Vulnerability Database on April 2, 2026, with the most recent update on April 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33544 actively exploited?
CVE-2026-33544 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33544?
CVE-2026-33544 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-33544?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33544, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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