FKIE_CVE-2026-14340
Vulnerability from fkie_nvd - Published: 2026-07-01 21:16 - Updated: 2026-07-02 17:47
Severity
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "affected",
"platforms": [
"Linux"
],
"product": "Enterprise Server",
"vendor": "GitHub",
"versions": [
{
"changes": [
{
"at": "3.16.20",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.16.19",
"status": "affected",
"version": "3.16.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.17.17",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.17.16",
"status": "affected",
"version": "3.17.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.18.11",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.18.10",
"status": "affected",
"version": "3.18.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.19.8",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.19.7",
"status": "affected",
"version": "3.19.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.20.4",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.20.3",
"status": "affected",
"version": "3.20.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.21.2",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.21.1",
"status": "affected",
"version": "3.21.0",
"versionType": "semver"
}
]
}
],
"source": "product-cna@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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\u0027s installation was explicitly granted access to that repository. An attacker who obtained a victim\u0027s 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."
}
],
"id": "CVE-2026-14340",
"lastModified": "2026-07-02T17:47:43.557",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "product-cna@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-14340",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-02T15:10:33.189761Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-01T21:16:43.743",
"references": [
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2"
}
],
"sourceIdentifier": "product-cna@github.com",
"vulnStatus": "Undergoing Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-863"
}
],
"source": "product-cna@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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