CVE-2026-2370: GitLab Auth Bypass Vulnerability

CVE-2026-2370 Overview

A critical authorization bypass vulnerability has been discovered in GitLab CE/EE affecting Jira Connect installations. This improper authorization flaw allows an authenticated user with minimal workspace permissions to obtain installation credentials and impersonate the GitLab app within integrated Jira environments. The vulnerability stems from insufficient authorization checks in the Jira Connect integration component.

Critical Impact

Authenticated attackers with low-level permissions can steal Jira Connect installation credentials and impersonate the GitLab application, potentially compromising the entire integration between GitLab and Jira instances.

Affected Products

• GitLab Community Edition (CE) versions 14.3 to before 18.8.7
• GitLab Enterprise Edition (EE) versions 18.9 to before 18.9.3
• GitLab CE/EE version 18.10.0 (before 18.10.1)

Discovery Timeline

• 2026-03-25 - GitLab releases security patch 18.10.1
• 2026-03-30 - CVE CVE-2026-2370 published to NVD
• 2026-03-30 - Last updated in NVD database

Technical Details for CVE-2026-2370

Vulnerability Analysis

This vulnerability is classified under CWE-233 (Improper Handling of Parameters) and relates to improper authorization checks within the GitLab Jira Connect integration. The flaw allows users who have been granted only minimal workspace permissions to access sensitive installation credentials that should be restricted to higher-privileged accounts. Once obtained, these credentials enable an attacker to impersonate the GitLab application when communicating with connected Jira instances.

The attack can be executed remotely over the network without requiring user interaction, making it particularly dangerous for organizations with Jira Connect integrations enabled. The successful exploitation impacts confidentiality, integrity, and availability of both the GitLab instance and any connected Jira systems.

Root Cause

The root cause of this vulnerability is improper authorization validation in the Jira Connect integration module. The affected code paths fail to properly verify whether the requesting user has sufficient privileges before exposing installation credentials. This authorization gap exists across multiple version branches, indicating a systemic issue in how permission checks were implemented for the Jira Connect feature introduced in version 14.3.

Attack Vector

An attacker exploiting CVE-2026-2370 would follow this general approach:

1. Authenticate to a vulnerable GitLab instance with any valid user account that has minimal workspace permissions
2. Access the Jira Connect integration endpoints that expose installation credentials
3. Extract the installation credentials due to missing authorization checks
4. Use the obtained credentials to impersonate the GitLab application
5. Perform unauthorized actions on connected Jira instances or manipulate the integration

The vulnerability requires network access to the GitLab instance and low-privilege authentication. Technical details are available in the HackerOne Report #3522829 and GitLab Work Item #589635.

Detection Methods for CVE-2026-2370

Indicators of Compromise

• Unusual API requests to Jira Connect integration endpoints from low-privileged user accounts
• Unexpected access patterns to /api/v4/jira_connect or similar integration endpoints
• Credential access logs showing retrieval of Jira Connect installation secrets by unauthorized users
• Anomalous activity in Jira instances that appears to originate from the GitLab integration

Detection Strategies

• Monitor GitLab application logs for access to Jira Connect configuration endpoints by users without administrative privileges
• Implement alerting on credential access events within the Jira Connect integration module
• Review audit logs for privilege escalation attempts or unauthorized API access patterns
• Deploy network monitoring to identify suspicious traffic between GitLab and Jira instances

Monitoring Recommendations

• Enable detailed audit logging for all Jira Connect integration activities
• Implement SIEM rules to correlate low-privilege user access with sensitive integration endpoints
• Regularly review user permissions and access patterns for Jira Connect features
• Monitor for any new or modified OAuth applications or integration tokens

How to Mitigate CVE-2026-2370

Immediate Actions Required

• Upgrade GitLab CE/EE to version 18.10.1, 18.9.3, or 18.8.7 depending on your current version branch
• Review and rotate any Jira Connect installation credentials that may have been exposed
• Audit user access logs for any suspicious access to Jira Connect integration endpoints
• Temporarily disable Jira Connect integration if immediate patching is not possible

Patch Information

GitLab has released patched versions addressing this vulnerability:

Download the appropriate patch from the GitLab Patch Release 18.10.1 announcement page. Organizations running self-managed GitLab instances should prioritize this update, especially those with active Jira Connect integrations.

Workarounds

• Disable the Jira Connect integration temporarily until patches can be applied
• Restrict network access to GitLab API endpoints using firewall rules
• Implement additional authentication requirements for integration management endpoints
• Review and minimize user workspace permissions to reduce the attack surface

# Disable Jira Connect integration (GitLab Rails console)
gitlab-rails runner "ApplicationSetting.current.update(jira_connect_enabled: false)"

# Verify the setting is disabled
gitlab-rails runner "puts ApplicationSetting.current.jira_connect_enabled"