CVE-2026-76851

HIGHNVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a privileged service, leading to elevated code execution. Exploitation required pre-receive hook networking to be enabled and either site administrator privileges or write access to a repository containing a configured pre-receive hook. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.20, 3.18.14, 3.19.11, 3.20.7, and 3.21.5. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

Advisory Details (5)

Auto-updated Sep 1, 2026
No patch confirmed yet.
generic

Release notes - GitHub Enterprise Server 3.21 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.21.5
generic

Release notes - GitHub Enterprise Server 3.20 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.7
generic

Release notes - GitHub Enterprise Server 3.19 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.11
generic

Release notes - GitHub Enterprise Server 3.18 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.14
generic

Release notes - GitHub Enterprise Server 3.17 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.20

Vendor Advisories for CVE-2026-76851(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 27× in last 7d / 81× 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. 2026-09-21 05:37 UTCEG score recompute
  2. 2026-09-21 05:37 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 18:25 UTCGHSA enrichment
  5. 2026-09-20 07:14 UTCGHSA enrichment
  6. 2026-09-19 19:55 UTCEG score recompute
  7. 2026-09-19 19:55 UTCGHSA enrichment
  8. 2026-09-19 08:43 UTCGHSA enrichment
  9. 2026-09-18 21:24 UTCEG score recompute
  10. 2026-09-18 21:24 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 09:38 UTCGHSA enrichment
  13. 2026-09-17 22:26 UTCEG score recompute
  14. 2026-09-17 22:26 UTCGHSA enrichment
  15. 2026-09-17 11:14 UTCGHSA enrichment
  16. 2026-09-17 00:03 UTCEG score recompute
  17. 2026-09-17 00:03 UTCGHSA enrichment
  18. 2026-09-16 14:08 UTCEPSS rescore
  19. 2026-09-16 12:52 UTCEG score recompute
  20. 2026-09-16 12:52 UTCGHSA enrichment
  21. 2026-09-16 05:15 UTCEPSS rescore
  22. 2026-09-16 01:41 UTCGHSA enrichment
  23. 2026-09-15 14:30 UTCGHSA enrichment
  24. 2026-09-15 03:19 UTCEG score recompute
  25. 2026-09-15 03:19 UTCGHSA enrichment
Show 56 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-14 16:08 UTCGHSA enrichment
  3. 2026-09-14 04:57 UTCGHSA enrichment
  4. 2026-09-13 17:47 UTCEG score recompute
  5. 2026-09-13 17:47 UTCGHSA enrichment
  6. 2026-09-13 06:36 UTCGHSA enrichment
  7. 2026-09-12 19:25 UTCEG score recompute
  8. 2026-09-12 19:25 UTCGHSA enrichment
  9. 2026-09-12 15:02 UTCEPSS rescore
  10. 2026-09-12 08:15 UTCGHSA enrichment
  11. 2026-09-11 21:04 UTCEG score recompute
  12. 2026-09-11 21:04 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 09:53 UTCEG score recompute
  15. 2026-09-11 09:53 UTCGHSA enrichment
  16. 2026-09-10 22:41 UTCGHSA enrichment
  17. 2026-09-10 11:30 UTCEG score recompute
  18. 2026-09-10 11:30 UTCGHSA enrichment
  19. 2026-09-10 09:35 UTCEPSS rescore
  20. 2026-09-09 23:35 UTCGHSA enrichment
  21. 2026-09-09 11:35 UTCGHSA enrichment
  22. 2026-09-09 00:24 UTCEG score recompute
  23. 2026-09-09 00:24 UTCGHSA enrichment
  24. 2026-09-08 22:01 UTCEPSS rescore
  25. 2026-09-08 13:13 UTCEG score recompute▲ 1.10
  26. 2026-09-08 13:13 UTCGHSA enrichment
  27. 2026-09-08 13:08 UTCNVD updateCVSS v3 → 8.8
  28. 2026-09-08 10:01 UTCGHSA enrichment
  29. 2026-09-07 21:50 UTCEG score recompute
  30. 2026-09-07 21:50 UTCGHSA enrichment
  31. 2026-09-07 10:39 UTCGHSA enrichment
  32. 2026-09-06 23:26 UTCEG score recompute
  33. 2026-09-06 23:26 UTCGHSA enrichment
  34. 2026-09-06 13:48 UTCEPSS rescore
  35. 2026-09-06 12:15 UTCGHSA enrichment
  36. 2026-09-06 00:58 UTCEG score recompute
  37. 2026-09-06 00:58 UTCGHSA enrichment
  38. 2026-09-05 13:45 UTCGHSA enrichment
  39. 2026-09-05 02:31 UTCGHSA enrichment
  40. 2026-09-04 15:19 UTCEG score recompute
  41. 2026-09-04 15:19 UTCGHSA enrichment
  42. 2026-09-04 05:07 UTCEPSS rescore
  43. 2026-09-04 04:07 UTCGHSA enrichment
  44. 2026-09-03 16:56 UTCGHSA enrichment
  45. 2026-09-03 12:00 UTCGHSA enrichment
  46. 2026-09-03 00:44 UTCEG score recompute
  47. 2026-09-03 00:44 UTCGHSA enrichment
  48. 2026-09-02 14:12 UTCEPSS rescore
  49. 2026-09-02 13:34 UTCEG score recompute
  50. 2026-09-02 13:34 UTCGHSA enrichment
  51. 2026-09-02 13:16 UTCEG score recompute
  52. 2026-09-02 13:16 UTCGHSA enrichment
  53. 2026-09-02 09:32 UTCGHSA enrichment
  54. 2026-09-01 22:19 UTCEG score recompute
  55. 2026-09-01 21:58 UTCEG score recompute
  56. 2026-09-01 21:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76851?
CVE-2026-76851 is a high vulnerability published on September 1, 2026. A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed remote code execution on the instance. Insufficient network isolation allowed malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests to a…
When was CVE-2026-76851 disclosed?
CVE-2026-76851 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76851 actively exploited?
CVE-2026-76851 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.6% of all scored CVEs.
What is the CVSS score of CVE-2026-76851?
CVE-2026-76851 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-76851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76851, 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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