FKIE_CVE-2026-10585
Vulnerability from fkie_nvd - Published: 2026-06-30 22:16 - Updated: 2026-07-01 19:57
Severity
Summary
A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user's browser by injecting a crafted payload into the title of a Discussion in the Q&A category. The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a <script type="application/ld+json"> block, allowing the title to break out of the script context. The injection was escalated to a full cross-site scripting attack on GitHub Enterprise Server by leveraging JSONP callback support in the REST API to bypass the Content Security Policy. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 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",
"product": "Enterprise Server",
"vendor": "GitHub",
"versions": [
{
"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": "3.16.20",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.16.19",
"status": "affected",
"version": "3.16.0",
"versionType": "semver"
}
]
}
],
"source": "product-cna@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user\u0027s browser by injecting a crafted payload into the title of a Discussion in the Q\u0026A category. The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a \u003cscript type=\"application/ld+json\"\u003e block, allowing the title to break out of the script context. The injection was escalated to a full cross-site scripting attack on GitHub Enterprise Server by leveraging JSONP callback support in the REST API to bypass the Content Security Policy. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 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-2026-10585",
"lastModified": "2026-07-01T19:57:18.920",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.3,
"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": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/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": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "product-cna@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-10585",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-01T15:36:51.127934Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-30T22:16:45.483",
"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"
}
],
"sourceIdentifier": "product-cna@github.com",
"vulnStatus": "Undergoing Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-79"
}
],
"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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