CVE-2026-26247

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH 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
Trending — 3 sources updated this week
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(high)
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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (4)

Auto-updated Jul 7, 2026
Patch available. Sources: github_pr, github_release.
generic

Gitea 1.25.5 is released | Gitea Blog

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

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 42× in last 7d / 129× 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 129 total refreshes for this CVE.

  1. 2026-07-30 21:59 UTCGHSA enrichment
  2. 2026-07-30 17:46 UTCEG score recompute
  3. 2026-07-30 17:46 UTCGHSA enrichment
  4. 2026-07-30 16:27 UTCEPSS rescore
  5. 2026-07-30 13:49 UTCGHSA enrichment
  6. 2026-07-30 09:52 UTCEG score recompute
  7. 2026-07-30 09:52 UTCGHSA enrichment
  8. 2026-07-30 05:54 UTCGHSA enrichment
  9. 2026-07-30 01:49 UTCEG score recompute
  10. 2026-07-30 01:49 UTCGHSA enrichment
  11. 2026-07-30 01:30 UTCEPSS rescore
  12. 2026-07-29 21:40 UTCGHSA enrichment
  13. 2026-07-29 16:58 UTCGHSA enrichment
  14. 2026-07-29 13:02 UTCGHSA enrichment
  15. 2026-07-29 09:05 UTCGHSA enrichment
  16. 2026-07-29 05:10 UTCGHSA enrichment
  17. 2026-07-29 01:14 UTCGHSA enrichment
  18. 2026-07-28 21:19 UTCGHSA enrichment
  19. 2026-07-28 17:19 UTCEG score recompute
  20. 2026-07-28 17:19 UTCGHSA enrichment
  21. 2026-07-28 15:36 UTCEPSS rescore
  22. 2026-07-28 13:08 UTCGHSA enrichment
  23. 2026-07-28 09:08 UTCGHSA enrichment
  24. 2026-07-28 05:05 UTCGHSA enrichment
  25. 2026-07-28 00:57 UTCGHSA enrichment
Show 75 more
  1. 2026-07-27 21:01 UTCGHSA enrichment
  2. 2026-07-27 17:03 UTCEG score recompute
  3. 2026-07-27 17:03 UTCGHSA enrichment
  4. 2026-07-27 13:05 UTCGHSA enrichment
  5. 2026-07-27 09:02 UTCGHSA enrichment
  6. 2026-07-27 05:07 UTCGHSA enrichment
  7. 2026-07-27 00:52 UTCGHSA enrichment
  8. 2026-07-26 20:46 UTCGHSA enrichment
  9. 2026-07-26 16:50 UTCEG score recompute
  10. 2026-07-26 16:50 UTCGHSA enrichment
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-26 14:54 UTCEPSS rescore
  13. 2026-07-26 12:54 UTCEG score recompute
  14. 2026-07-26 12:54 UTCGHSA enrichment
  15. 2026-07-25 14:18 UTCEPSS rescore
  16. 2026-07-25 14:17 UTCEPSS rescore
  17. 2026-07-24 14:17 UTCEPSS rescore
  18. 2026-07-23 14:18 UTCEPSS rescore
  19. 2026-07-23 14:18 UTCEPSS rescore
  20. 2026-07-23 03:07 UTCEG score recompute
  21. 2026-07-22 14:08 UTCEPSS rescore
  22. 2026-07-22 14:08 UTCEPSS rescore
  23. 2026-07-21 15:24 UTCEPSS rescore
  24. 2026-07-21 15:24 UTCEPSS rescore
  25. 2026-07-20 17:08 UTCEPSS rescore
  26. 2026-07-20 17:08 UTCEPSS rescore
  27. 2026-07-19 14:31 UTCEPSS rescore
  28. 2026-07-19 14:31 UTCEPSS rescore
  29. 2026-07-19 02:29 UTCEPSS rescore
  30. 2026-07-18 10:04 UTCEPSS rescore
  31. 2026-07-18 10:04 UTCEPSS rescore
  32. 2026-07-17 03:26 UTCGHSA enrichment
  33. 2026-07-16 23:31 UTCGHSA enrichment
  34. 2026-07-16 19:36 UTCGHSA enrichment
  35. 2026-07-16 17:03 UTCEPSS rescore
  36. 2026-07-16 17:03 UTCEPSS rescore
  37. 2026-07-16 15:38 UTCGHSA enrichment
  38. 2026-07-16 11:36 UTCGHSA enrichment
  39. 2026-07-16 07:41 UTCGHSA enrichment
  40. 2026-07-16 03:46 UTCGHSA enrichment
  41. 2026-07-15 23:51 UTCGHSA enrichment
  42. 2026-07-15 19:56 UTCGHSA enrichment
  43. 2026-07-15 16:57 UTCEPSS rescore
  44. 2026-07-15 16:57 UTCEPSS rescore
  45. 2026-07-15 16:01 UTCGHSA enrichment
  46. 2026-07-15 12:03 UTCGHSA enrichment
  47. 2026-07-15 08:06 UTCGHSA enrichment
  48. 2026-07-15 04:11 UTCGHSA enrichment
  49. 2026-07-15 02:00 UTCEPSS rescore
  50. 2026-07-15 02:00 UTCEPSS rescore
  51. 2026-07-15 00:10 UTCGHSA enrichment
  52. 2026-07-14 20:13 UTCGHSA enrichment
  53. 2026-07-14 16:16 UTCGHSA enrichment
  54. 2026-07-14 12:21 UTCGHSA enrichment
  55. 2026-07-14 08:25 UTCGHSA enrichment
  56. 2026-07-14 04:29 UTCGHSA enrichment
  57. 2026-07-14 00:32 UTCGHSA enrichment
  58. 2026-07-13 22:30 UTCEPSS rescore
  59. 2026-07-13 20:36 UTCGHSA enrichment
  60. 2026-07-13 16:40 UTCGHSA enrichment
  61. 2026-07-13 12:44 UTCGHSA enrichment
  62. 2026-07-13 08:47 UTCGHSA enrichment
  63. 2026-07-13 06:13 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-13 04:47 UTCGHSA enrichment
  66. 2026-07-13 00:51 UTCGHSA enrichment
  67. 2026-07-12 20:55 UTCGHSA enrichment
  68. 2026-07-12 16:55 UTCGHSA enrichment
  69. 2026-07-12 12:58 UTCGHSA enrichment
  70. 2026-07-12 09:02 UTCGHSA enrichment
  71. 2026-07-12 05:46 UTCEPSS rescore
  72. 2026-07-12 05:46 UTCEPSS rescore
  73. 2026-07-12 05:05 UTCGHSA enrichment
  74. 2026-07-12 01:09 UTCGHSA enrichment
  75. 2026-07-11 21:14 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 69.4% 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.

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