A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4 and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.

The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

  - A stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown in GitLab CE/EE version 8.4     and above allowed an attacker to execute arbitrary JavaScript code on the victim's behalf.
    (CVE-2021-39887)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Gitlab reports :

Stored XSS in merge request creation page

Denial-of-service attack in Markdown parser

Stored Cross-Site Scripting vulnerability in the GitLab Flavored Markdown

DNS Rebinding vulnerability in Gitea importer

Exposure of trigger tokens on project exports

Improper access control for users with expired password

Access tokens are not cleared after impersonation

Reflected Cross-Site Scripting in Jira Integration

DNS Rebinding vulnerability in Fogbugz importer

Access tokens persist after project deletion

User enumeration vulnerability

Potential DOS via API requests

Pending invitations of public groups and public projects are visible to any user

Bypass Disabled Repo by URL Project Creation

Low privileged users can see names of the private groups shared in projects

API discloses sensitive info to low privileged users

Epic listing do not honour group memberships

Insecure Direct Object Reference vulnerability may lead to protected branch names getting disclosed

Low privileged users can import users from projects that they they are not a maintainer on

Potential DOS via dependencies API

Create a project with unlimited repository size through malicious Project Import

Bypass disabled Bitbucket Server import source project creation

Requirement to enforce 2FA is not honored when using git commands

Content spoofing vulnerability

Improper session management in impersonation feature

Create OAuth application with arbitrary scopes through content spoofing

Lack of account lockout on change password functionality

Epic reference was not updated while moved between groups

Missing authentication allows disabling of two-factor authentication

Information disclosure in SendEntry

ID	Name	Product	Family	Severity
187472	GitLab 8.4 < 14.1.7 / 14.2 < 14.2.5 / 14.3 < 14.3.1 (CVE-2021-39887)	Nessus	CGI abuses	medium
153870	FreeBSD : Gitlab -- vulnerabilities (1bdd4db6-2223-11ec-91be-001b217b3468)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2021-39887

medium

Tenable Plugins

medium

high