CVE-2023-3906 Improper Validation of Specified Type of Input in GitLab
Authenticated attackers can bypass GitLab's asset proxy by crafting malicious image URLs, potentially exposing internal resources or violating security policies.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-3906?
CVE-2023-3906 is a low-severity vulnerability in Gitlab Gitlab, published on 29 Sep 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
An input validation issue in the asset proxy in GitLab EE, affecting all versions from 12.3 prior to 16.2.8, 16.3 prior to 16.3.5, and 16.4 prior to 16.4.1, allowed an authenticated attacker to craft image urls which bypass the asset proxy.
Weakness: CWE-1287
Which versions are affected by CVE-2023-3906?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 12.3.0 | 16.2.8, 16.3.5, 16.4.1 |
Products include Gitlab Gitlab.
How do I fix CVE-2023-3906?
Upgrade gitlab to a fixed version for your release line: 16.2.8, 16.3.5 or 16.4.1.
Is CVE-2023-3906 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-3906 exists.
Other vulnerabilities in Gitlab Gitlab
- CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound
- CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal
- CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control
- CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution
- CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF)
Sources
Also known as BIT-gitlab-2023-3906, GHSA-x2v6-6q9m-6qx9.