CVE-2026-18730 (GCVE-0-2026-18730)
Vulnerability from cvelistv5
Published
2026-09-01 21:54
Modified
2026-09-02 13:19
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| GitHub | Enterprise Server |
Version: 3.17.0 ≤ 3.17.18 Version: 3.18.0 ≤ 3.18.12 Version: 3.19.0 ≤ 3.19.9 Version: 3.20.0 ≤ 3.20.5 Version: 3.21.0 ≤ 3.21.3 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-18730",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-02T13:18:25.983888Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-02T13:19:21.618Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "affected",
"product": "Enterprise Server",
"vendor": "GitHub",
"versions": [
{
"changes": [
{
"at": "3.17.19",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.17.18",
"status": "affected",
"version": "3.17.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.18.13",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.18.12",
"status": "affected",
"version": "3.18.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.19.10",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.19.9",
"status": "affected",
"version": "3.19.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.20.6",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.20.5",
"status": "affected",
"version": "3.20.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.21.4",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.21.3",
"status": "affected",
"version": "3.21.0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "griffinf"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eA 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.\u003c/p\u003e"
}
],
"value": "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."
}
],
"impacts": [
{
"capecId": "CAPEC-664",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-664 Server Side Request Forgery"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "CWE-918 Server-Side Request Forgery (SSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T21:54:58.397Z",
"orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
"shortName": "GitHub_P"
},
"references": [
{
"tags": [
"release-notes"
],
"url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.19"
},
{
"tags": [
"release-notes"
],
"url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.13"
},
{
"tags": [
"release-notes"
],
"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.10"
},
{
"tags": [
"release-notes"
],
"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.6"
},
{
"tags": [
"release-notes"
],
"url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.4"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Server-side request forgery vulnerability in GitHub Enterprise Server Manage API leaked a replayable gateway-agent bearer token",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
"assignerShortName": "GitHub_P",
"cveId": "CVE-2026-18730",
"datePublished": "2026-09-01T21:54:58.397Z",
"dateReserved": "2026-08-03T18:33:43.917Z",
"dateUpdated": "2026-09-02T13:19:21.618Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"Server-side request forgery vulnerability in GitHub Enterprise Server Manage API leaked a replayable gateway-agent bearer token\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"griffinf\"}], \"impacts\": [{\"capecId\": \"CAPEC-664\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-664 Server Side Request Forgery\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"GitHub\", \"product\": \"Enterprise Server\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"3.17.19\", \"status\": \"unaffected\"}], \"version\": \"3.17.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"3.17.18\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"3.18.13\", \"status\": \"unaffected\"}], \"version\": \"3.18.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"3.18.12\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"3.19.10\", \"status\": \"unaffected\"}], \"version\": \"3.19.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"3.19.9\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"3.20.6\", \"status\": \"unaffected\"}], \"version\": \"3.20.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"3.20.5\"}, {\"status\": \"affected\", \"changes\": [{\"at\": \"3.21.4\", \"status\": \"unaffected\"}], \"version\": \"3.21.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"3.21.3\"}], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.19\", \"tags\": [\"release-notes\"]}, {\"url\": \"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.13\", \"tags\": [\"release-notes\"]}, {\"url\": \"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.10\", \"tags\": [\"release-notes\"]}, {\"url\": \"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.6\", \"tags\": [\"release-notes\"]}, {\"url\": \"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.4\", \"tags\": [\"release-notes\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eA 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-918\", \"description\": \"CWE-918 Server-Side Request Forgery (SSRF)\"}]}], \"providerMetadata\": {\"orgId\": \"82327ea3-741d-41e4-88f8-2cf9e791e760\", \"shortName\": \"GitHub_P\", \"dateUpdated\": \"2026-09-01T21:54:58.397Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-18730\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-02T13:18:25.983888Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-09-02T13:19:17.995Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-18730\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-01T21:54:58.397Z\", \"dateReserved\": \"2026-08-03T18:33:43.917Z\", \"assignerOrgId\": \"82327ea3-741d-41e4-88f8-2cf9e791e760\", \"datePublished\": \"2026-09-01T21:54:58.397Z\", \"assignerShortName\": \"GitHub_P\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…