CVE-2026-18730

HIGHNVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. NVD baseline CVSS 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: 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 an unauthenticated attacker to cause the Manage API to send crafted outbound requests to an attacker-controlled host. An unauthenticated endpoint parsed an attacker-supplied cluster configuration and issued gateway-to-agent requests whose HMAC authenticated only a timestamp, not the request path or body. An attacker positioned to intercept the outbound request could capture this token and replay it against privileged management agent endpoints. High-availability deployments were not affected due to a topology restriction. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.19, 3.18.13, 3.19.10, 3.20.6, and 3.21.4. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 10, 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#3.21.4
generic

Release notes - GitHub Enterprise Server 3.20 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.6
generic

Release notes - GitHub Enterprise Server 3.19 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.10
generic

Release notes - GitHub Enterprise Server 3.18 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.13
generic

Release notes - GitHub Enterprise Server 3.17 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.19

Vendor Advisories for CVE-2026-18730(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 24× in last 7d / 78× 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. 2026-09-20 22:21 UTCEG score recompute
  2. 2026-09-20 22:21 UTCGHSA enrichment
  3. 2026-09-20 10:13 UTCGHSA enrichment
  4. 2026-09-19 22:05 UTCEG score recompute
  5. 2026-09-19 22:05 UTCGHSA enrichment
  6. 2026-09-19 09:57 UTCGHSA enrichment
  7. 2026-09-18 21:24 UTCEG score recompute
  8. 2026-09-18 21:24 UTCGHSA enrichment
  9. 2026-09-18 19:27 UTCEPSS rescore
  10. 2026-09-18 08:47 UTCGHSA enrichment
  11. 2026-09-17 20:40 UTCEG score recompute
  12. 2026-09-17 20:40 UTCGHSA enrichment
  13. 2026-09-17 06:47 UTCGHSA enrichment
  14. 2026-09-16 18:38 UTCEG score recompute
  15. 2026-09-16 18:38 UTCGHSA enrichment
  16. 2026-09-16 14:07 UTCEPSS rescore
  17. 2026-09-16 05:31 UTCEG score recompute
  18. 2026-09-16 05:31 UTCGHSA enrichment
  19. 2026-09-16 05:14 UTCEPSS rescore
  20. 2026-09-15 17:24 UTCGHSA enrichment
  21. 2026-09-15 05:16 UTCEG score recompute
  22. 2026-09-15 05:15 UTCGHSA enrichment
  23. 2026-09-14 17:02 UTCGHSA enrichment
  24. 2026-09-14 04:55 UTCGHSA enrichment
  25. 2026-09-13 16:48 UTCEG score recompute
Show 53 more
  1. 2026-09-13 16:48 UTCGHSA enrichment
  2. 2026-09-13 16:46 UTCEPSS rescore
  3. 2026-09-13 04:40 UTCGHSA enrichment
  4. 2026-09-12 16:31 UTCEG score recompute
  5. 2026-09-12 16:31 UTCGHSA enrichment
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-12 04:23 UTCGHSA enrichment
  8. 2026-09-11 16:16 UTCEG score recompute
  9. 2026-09-11 16:16 UTCGHSA enrichment
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-11 04:09 UTCEG score recompute
  13. 2026-09-11 04:09 UTCGHSA enrichment
  14. 2026-09-10 16:01 UTCEG score recompute▼ 0.80
  15. 2026-09-10 16:01 UTCGHSA enrichment
  16. 2026-09-10 15:57 UTCNVD updateCVSS v3 → 7.4
  17. 2026-09-10 11:43 UTCEG score recompute
  18. 2026-09-10 11:43 UTCGHSA enrichment
  19. 2026-09-10 09:34 UTCEPSS rescore
  20. 2026-09-09 23:35 UTCGHSA enrichment
  21. 2026-09-09 11:25 UTCGHSA enrichment
  22. 2026-09-08 23:18 UTCEG score recompute
  23. 2026-09-08 23:17 UTCGHSA enrichment
  24. 2026-09-08 22:00 UTCEPSS rescore
  25. 2026-09-08 06:05 UTCGHSA enrichment
  26. 2026-09-07 17:57 UTCEG score recompute
  27. 2026-09-07 17:57 UTCGHSA enrichment
  28. 2026-09-07 16:01 UTCEPSS rescore
  29. 2026-09-07 05:49 UTCGHSA enrichment
  30. 2026-09-06 17:43 UTCEG score recompute
  31. 2026-09-06 17:43 UTCGHSA enrichment
  32. 2026-09-06 13:47 UTCEPSS rescore
  33. 2026-09-06 05:35 UTCGHSA enrichment
  34. 2026-09-05 17:28 UTCEG score recompute
  35. 2026-09-05 17:28 UTCGHSA enrichment
  36. 2026-09-05 05:20 UTCGHSA enrichment
  37. 2026-09-04 17:13 UTCEG score recompute
  38. 2026-09-04 17:13 UTCGHSA enrichment
  39. 2026-09-04 05:06 UTCEG score recompute
  40. 2026-09-04 05:06 UTCGHSA enrichment
  41. 2026-09-04 05:06 UTCEPSS rescore
  42. 2026-09-03 16:56 UTCGHSA enrichment
  43. 2026-09-03 14:51 UTCGHSA enrichment
  44. 2026-09-03 02:41 UTCGHSA enrichment
  45. 2026-09-02 14:29 UTCEG score recompute
  46. 2026-09-02 14:28 UTCGHSA enrichment
  47. 2026-09-02 14:11 UTCEPSS rescore
  48. 2026-09-02 13:34 UTCEG score recompute
  49. 2026-09-02 13:34 UTCGHSA enrichment
  50. 2026-09-02 10:29 UTCGHSA enrichment
  51. 2026-09-01 22:19 UTCEG score recompute
  52. 2026-09-01 21:58 UTCEG score recompute
  53. 2026-09-01 21:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18730?
CVE-2026-18730 is a high vulnerability published on September 1, 2026. A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause the Manage API to send crafted outbound requests to an attacker-controlled host. An unauthenticated endpoint parsed an attacker-supplied cluster…
When was CVE-2026-18730 disclosed?
CVE-2026-18730 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18730 actively exploited?
CVE-2026-18730 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 78.1% of all scored CVEs.
What is the CVSS score of CVE-2026-18730?
CVE-2026-18730 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-18730?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18730, 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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