CVE-2026-14340

MEDIUMNVD 5.05.0—
EchelonGraph scoreHIGH confidence

Score 5.0 from GitHub Security Advisory published 2026-07-01. NVD baseline CVSS 5.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.0Exploit: NoneExposed: 0

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

An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS v3
5.0
EG Score
5.0(high)
EPSS
20.2%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 6, 2026

Advisory Details (6)

Auto-updated Jul 3, 2026
No patch confirmed yet.
generic

Release notes - GitHub Enterprise Server 3.21 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.21.2
generic

Release notes - GitHub Enterprise Server 3.20 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4
generic

Release notes - GitHub Enterprise Server 3.19 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8
generic

Release notes - GitHub Enterprise Server 3.18 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11
generic

Release notes - GitHub Enterprise Server 3.17 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17
generic

Release notes - GitHub Enterprise Server 3.16 Docs

https://docs.github.com/en/[email protected]/admin/release-notes#3.16.20

Vendor Advisories for CVE-2026-14340(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 21× in last 7d / 21× 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. 2026-07-07 08:46 UTCEG score recompute▼ 0.30
  2. 2026-07-07 08:46 UTCGHSA enrichment
  3. 2026-07-06 18:21 UTCNVD updateCVSS v3 → 5
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 10:25 UTCEG score recompute
  6. 2026-07-06 10:24 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 12:00 UTCEG score recompute
  9. 2026-07-05 11:59 UTCGHSA enrichment
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 13:40 UTCEG score recompute
  13. 2026-07-04 13:39 UTCGHSA enrichment
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 15:19 UTCEG score recompute
  16. 2026-07-03 15:19 UTCGHSA enrichment
  17. 2026-07-02 16:58 UTCEG score recompute▲ 5.30
  18. 2026-07-02 16:58 UTCGHSA enrichment
  19. 2026-07-02 16:58 UTCNVD updateCVSS v3 → 5.3 · CVSS v4 → 5.3
  20. 2026-07-01 22:02 UTCEG score recompute
  21. 2026-07-01 22:02 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-14340?
CVE-2026-14340 is a medium vulnerability published on July 1, 2026. An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization…
When was CVE-2026-14340 disclosed?
CVE-2026-14340 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14340 actively exploited?
CVE-2026-14340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-14340?
CVE-2026-14340 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-14340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14340, 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

Explore the affected products and dependency analysis for CVE-2026-14340

Explore →

Is Your Infrastructure Affected by CVE-2026-14340?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs