CVE-2026-26247

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (4)

Auto-updated Sep 8, 2026
Patch available. Sources: github_pr, github_release.
github_release Patch Available

v1.25.5

Patch available: go-gitea/gitea v1.25.5

https://github.com/go-gitea/gitea/releases/tag/v1.25.5
github_pr

Fix oauth2 s256 (#36462)

Fix merged in go-gitea/gitea PR #36477 on 2026-01-28 — awaiting tagged release

https://github.com/go-gitea/gitea/pull/36477
github_pr

Fix oauth2 s256

Fix merged in go-gitea/gitea PR #36462 on 2026-01-28 — awaiting tagged release

https://github.com/go-gitea/gitea/pull/36462
generic

Gitea 1.25.5 is released | Gitea Blog

https://blog.gitea.com/release-of-1.25.5/

Vendor Advisories for CVE-2026-26247(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
code.gitea.io/gitea—1.25.5—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 121× 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.

Showing the most recent 100 of 351 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-10 09:34 UTCEPSS rescore
  3. 2026-09-08 22:00 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 14:17 UTCEG score recompute
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-05 23:40 UTCEG score recompute
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:11 UTCEPSS rescore
  11. 2026-09-01 13:53 UTCEPSS rescore
  12. 2026-09-01 04:39 UTCEPSS rescore
  13. 2026-08-31 00:41 UTCGHSA enrichment
  14. 2026-08-30 20:44 UTCEG score recompute
  15. 2026-08-30 20:44 UTCGHSA enrichment
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 16:49 UTCGHSA enrichment
  18. 2026-08-30 11:17 UTCEG score recompute
  19. 2026-08-30 11:17 UTCGHSA enrichment
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-28 02:45 UTCGHSA enrichment
  23. 2026-08-27 22:11 UTCEG score recompute
  24. 2026-08-27 22:11 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 75 more
  1. 2026-08-27 02:55 UTCEG score recompute
  2. 2026-08-27 02:55 UTCGHSA enrichment
  3. 2026-08-26 14:46 UTCEPSS rescore
  4. 2026-08-26 14:30 UTCEG score recompute
  5. 2026-08-26 14:30 UTCGHSA enrichment
  6. 2026-08-25 13:48 UTCEPSS rescore
  7. 2026-08-25 13:37 UTCGHSA enrichment
  8. 2026-08-25 04:41 UTCGHSA enrichment
  9. 2026-08-25 00:46 UTCGHSA enrichment
  10. 2026-08-24 20:51 UTCEG score recompute
  11. 2026-08-24 20:51 UTCGHSA enrichment
  12. 2026-08-24 14:14 UTCGHSA enrichment
  13. 2026-08-24 10:11 UTCEG score recompute
  14. 2026-08-24 10:11 UTCGHSA enrichment
  15. 2026-08-24 04:07 UTCGHSA enrichment
  16. 2026-08-23 22:19 UTCGHSA enrichment
  17. 2026-08-23 18:18 UTCGHSA enrichment
  18. 2026-08-23 14:23 UTCGHSA enrichment
  19. 2026-08-23 10:28 UTCGHSA enrichment
  20. 2026-08-23 06:33 UTCGHSA enrichment
  21. 2026-08-23 02:36 UTCEG score recompute
  22. 2026-08-23 02:36 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 22:38 UTCGHSA enrichment
  25. 2026-08-22 18:42 UTCGHSA enrichment
  26. 2026-08-22 13:45 UTCGHSA enrichment
  27. 2026-08-22 09:49 UTCGHSA enrichment
  28. 2026-08-22 05:53 UTCGHSA enrichment
  29. 2026-08-22 01:05 UTCEG score recompute
  30. 2026-08-22 01:05 UTCGHSA enrichment
  31. 2026-08-21 23:49 UTCEPSS rescore
  32. 2026-08-21 21:09 UTCGHSA enrichment
  33. 2026-08-21 17:14 UTCGHSA enrichment
  34. 2026-08-21 12:21 UTCGHSA enrichment
  35. 2026-08-21 08:21 UTCGHSA enrichment
  36. 2026-08-21 04:25 UTCGHSA enrichment
  37. 2026-08-20 23:42 UTCEG score recompute
  38. 2026-08-20 23:42 UTCGHSA enrichment
  39. 2026-08-20 22:55 UTCEPSS rescore
  40. 2026-08-20 19:46 UTCGHSA enrichment
  41. 2026-08-20 15:51 UTCGHSA enrichment
  42. 2026-08-20 11:32 UTCGHSA enrichment
  43. 2026-08-20 07:35 UTCGHSA enrichment
  44. 2026-08-20 03:40 UTCEG score recompute
  45. 2026-08-20 03:40 UTCGHSA enrichment
  46. 2026-08-19 17:03 UTCEPSS rescore
  47. 2026-08-19 13:13 UTCGHSA enrichment
  48. 2026-08-19 09:18 UTCGHSA enrichment
  49. 2026-08-19 04:51 UTCGHSA enrichment
  50. 2026-08-19 00:56 UTCGHSA enrichment
  51. 2026-08-18 20:51 UTCEG score recompute
  52. 2026-08-18 20:51 UTCGHSA enrichment
  53. 2026-08-18 13:48 UTCEPSS rescore
  54. 2026-08-18 11:43 UTCGHSA enrichment
  55. 2026-08-18 04:26 UTCGHSA enrichment
  56. 2026-08-17 22:46 UTCGHSA enrichment
  57. 2026-08-17 15:44 UTCEG score recompute
  58. 2026-08-17 15:44 UTCGHSA enrichment
  59. 2026-08-17 13:47 UTCEPSS rescore
  60. 2026-08-17 11:48 UTCGHSA enrichment
  61. 2026-08-17 07:44 UTCGHSA enrichment
  62. 2026-08-17 03:49 UTCGHSA enrichment
  63. 2026-08-16 23:53 UTCGHSA enrichment
  64. 2026-08-16 19:57 UTCGHSA enrichment
  65. 2026-08-16 16:01 UTCEG score recompute
  66. 2026-08-16 16:01 UTCGHSA enrichment
  67. 2026-08-16 14:56 UTCEPSS rescore
  68. 2026-08-16 12:05 UTCGHSA enrichment
  69. 2026-08-16 08:10 UTCGHSA enrichment
  70. 2026-08-16 04:15 UTCEG score recompute
  71. 2026-08-16 04:15 UTCGHSA enrichment
  72. 2026-08-16 02:14 UTCEPSS rescore
  73. 2026-08-16 00:20 UTCGHSA enrichment
  74. 2026-08-15 20:24 UTCGHSA enrichment
  75. 2026-08-15 16:28 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-26247?
CVE-2026-26247 is a critical vulnerability published on July 3, 2026. Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check.
When was CVE-2026-26247 disclosed?
CVE-2026-26247 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26247 actively exploited?
CVE-2026-26247 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.0% of all scored CVEs.
What is the CVSS score of CVE-2026-26247?
CVE-2026-26247 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-26247?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26247, 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.

Dependency Blast Radius

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