CVE-2026-15343

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 55% 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, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.6Exploit: None knownExposed: 0

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

A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker who had code execution inside the Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/ as the path validation did not check the effective path which the attacker could control through the dependency file's directory and symlink target. If the repository used a pull_request_target workflow or had auto-merge enabled, an injected workflow could execute with access to the repository's GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, 3.17.18.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity86% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

July 17, 2026

Last Modified

July 17, 2026

Advisory Details (5)

Auto-updated Jul 17, 2026
No patch confirmed yet.
generic

Release notes - GitHub Enterprise Server 3.21 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.21.3
generic

Release notes - GitHub Enterprise Server 3.20 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.5
generic

Release notes - GitHub Enterprise Server 3.19 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.9
generic

Release notes - GitHub Enterprise Server 3.18 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.12
generic

Release notes - GitHub Enterprise Server 3.17 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.18

Vendor Advisories for CVE-2026-15343(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 20× in last 7d / 112× 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 1,309 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-15343?
CVE-2026-15343 is a high vulnerability published on July 17, 2026. A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker who had code execution inside the Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/ as the path validation did…
When was CVE-2026-15343 disclosed?
CVE-2026-15343 was first published in the National Vulnerability Database on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15343 actively exploited?
CVE-2026-15343 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 55.4% of all scored CVEs.
What is the CVSS score of CVE-2026-15343?
CVE-2026-15343 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-15343?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15343, 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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