CVE-2026-9312
Server-Side Request Forgery vulnerability in GitHub Enterprise Server allowed access to internal services via path traversal in upload endpoint
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 3.16.20, 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.1. This vulnerability was reported via the GitHub Bug Bounty program.
INFO
Published Date :
May 27, 2026, 12:16 a.m.
Last Modified :
June 2, 2026, 6:31 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 82327ea3-741d-41e4-88f8-2cf9e791e760 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update GitHub Enterprise Server to version 3.21.1 or later.
- Apply the latest security patches for your version.
- Validate all user inputs on upload endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-9312.
| URL | Resource |
|---|---|
| https://docs.github.com/en/[email protected]/admin/release-notes#3.16.20 | Product Release Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17 | Product Release Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11 | Product Release Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8 | Product Release Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4 | Product Release Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1 | Product Release Notes |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-9312 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-9312
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-9312 vulnerability anywhere in the article.
-
CybersecurityNews
GitHub Enterprise Server 3.20.3 Released With Fox for Critical Vulnerabilities
GitHub has shipped GitHub Enterprise Server (GHES) 3.20.3 as a security‑driven patch release that fixes multiple critical and high‑severity vulnerabilities and rotates the signing key used to validate ... Read more
The following table lists the changes that have been made to the
CVE-2026-9312 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.17.0 up to (excluding) 3.17.16 *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.18.0 up to (excluding) 3.18.10 *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.19.0 up to (excluding) 3.19.7 *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.20.0 up to (excluding) 3.20.3 *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.16.0 up to (excluding) 3.16.19 *cpe:2.3:a:github:enterprise_server:3.21.1:rc1:*:*:*:*:*:* Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.16.20 Types: Product, Release Notes Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17 Types: Product, Release Notes Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11 Types: Product, Release Notes Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8 Types: Product, Release Notes Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4 Types: Product, Release Notes Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1 Types: Product, Release Notes -
New CVE Received by [email protected]
May. 27, 2026
Action Type Old Value New Value Added 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 3.16.20, 3.17.17, 3.18.11, 3.19.8, 3.20.4, and 3.21.1. This vulnerability was reported via the GitHub Bug Bounty program. Added CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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 Added CWE CWE-918 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.16.20 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1