CVE-2021-39881 Security feature bypass in GitLab
Attackers can create OAuth clients with spoofed scopes to trick users into granting unauthorized access, requiring GitLab administrators to apply patches.
- 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-2021-39881?
CVE-2021-39881 is a low-severity vulnerability in Gitlab Gitlab, published on 5 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In all versions of GitLab CE/EE since version 7.7, the application may let a malicious user create an OAuth client application with arbitrary scope names which may allow the malicious user to trick unsuspecting users to authorize the malicious client application using the spoofed scope name and description.
Which versions are affected by CVE-2021-39881?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 7.7.0 | 14.1.7, 14.2.5, 14.3.1 |
Products include Gitlab Gitlab.
How do I fix CVE-2021-39881?
Upgrade gitlab to a fixed version for your release line: 14.1.7, 14.2.5 or 14.3.1.
Is CVE-2021-39881 being exploited?
There is no known exploitation of CVE-2021-39881 in the wild and no public exploit code.
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-2021-39881, GHSA-4ff8-x6j5-88r4, UBUNTU-CVE-2021-39881.