CVE-2026-18730Server-side request forgery vulnerability in GitHub Enterprise Server Manage API leaked a replayable gateway-agent bearer token
Updated under an hour ago ()
Does this affect you?
It affects GitHub Enterprise Server. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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 GitHub Enterprise Server releases in the 3.17, 3.18, 3.19, 3.20, and 3.21 series and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. This vulnerability was reported via the GitHub Bug Bounty program.
- CVSS
- 8.2 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-918
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_P
- NVD analysis
- Modified
- Record last updated
- Sep 22, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GitHub Enterprise Server github:enterprise_server (from the name) | from 3.17.0 before 3.17.*; fixed at 3.17.21; from 3.18.0 before 3.18.*; fixed at 3.18.15; from 3.19.0 before 3.19.*; fixed at 3.19.12; from 3.20.0 before 3.20.*; fixed at 3.20.8; from 3.21.0 before 3.21.*; fixed at 3.21.6 | CNA record |
github enterprise_server github:enterprise_server | before 3.17.19; from 3.18.0 before 3.18.13; from 3.19.0 before 3.19.10; from 3.20.0 before 3.20.6; from 3.21.0 before 3.21.4 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.21release-notes
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.15release-notes
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.12release-notes
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.8release-notes
- https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.6release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.