High severity · published May 27, 2026
CVE-2026-9312
Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint
8.2
CVSS
9.2%
EPSS
No
On KEV
Description
A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to send crafted requests to internal services by exploiting insufficient input validation in an upload endpoint. By injecting path traversal content into request parameters, an attacker could bypass the intended request flow and redirect internal API calls, potentially accessing internal services and exposing sensitive credentials. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.2. This vulnerability was reported via the GitHub Bug Bounty program.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)9.2% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Enterprise Server · GitHub
3.16.0 through 3.16.19; 3.17.0 through 3.17.16; 3.18.0 through 3.18.10; 3.19.0 through 3.19.7; 3.20.0 through 3.20.3; 3.21.0 before 3.21.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9312
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9312
Product
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17
Product
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11
Product
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8
Product
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4
docs.github.com
https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.2
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