CVE-2026-8034
SSRF in GitHub Enterprise Server Notebook Viewer
Publication date: 2026-05-07
Last updated on: 2026-05-07
Assigner: GitHub, Inc. (Products Only)
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| github | enterprise_server | to 3.21 (exc) |
| github | enterprise_server | 3.16.18 |
| github | enterprise_server | 3.17.15 |
| github | enterprise_server | 3.18.9 |
| github | enterprise_server | 3.19.6 |
| github | enterprise_server | 3.20.2 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-436 | Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state. |
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a server-side request forgery (SSRF) issue found in the GitHub Enterprise Server notebook viewer. It occurs because the URL validation process uses a different URL parser than the HTTP request library. This mismatch allows an attacker to craft a URL that passes validation but causes the server to send a request to an unintended internal host. Exploiting this requires the attacker to have network access to the GitHub Enterprise Server instance.
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker could use it to access internal services that are normally not exposed externally. This could lead to unauthorized access to sensitive internal resources or data, potentially compromising the security of the affected GitHub Enterprise Server environment.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade your GitHub Enterprise Server to one of the fixed versions: 3.16.18, 3.17.15, 3.18.9, 3.19.6, or 3.20.2 or later.
Since exploitation requires network access to the GitHub Enterprise Server instance, restricting network access to trusted users and networks can also help reduce risk.