CVE-2025-53073: Sentry Auth Bypass Vulnerability

CVE-2025-53073 Overview

CVE-2025-53073 is a broken access control vulnerability in Sentry versions 25.1.0 through 25.5.1. An authenticated attacker can reach a project's issue endpoint and perform unauthorized actions, such as adding a comment, without being a member of the project's team. Exploitation requires knowledge of a seven-digit issue ID, which is not treated as a secret and may be mentioned publicly or predicted through enumeration. The weakness is classified under [CWE-425: Direct Request (Forced Browsing)]. Sentry addressed the flaw in later self-hosted releases.

Critical Impact
Any authenticated Sentry user can interact with issues belonging to projects they do not have team membership in, undermining project-level access boundaries.

Affected Products

Sentry 25.1.0 through 25.5.1 (self-hosted)
Sentry deployments exposing the issue endpoint to authenticated users
Sentry organizations with cross-team users lacking project isolation

Discovery Timeline

2025-06-24 - CVE-2025-53073 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53073

Vulnerability Analysis

Sentry's issue endpoint fails to enforce project team membership when servicing authenticated requests. An attacker holding valid credentials in the Sentry organization can address any issue by its numeric identifier and act on it, including posting comments. The authorization layer verifies authentication but does not validate that the requester belongs to the team that owns the target project. This flaw represents forced browsing, where server-side authorization checks depend on the assumption that resource identifiers remain unknown to unauthorized users. Because issue IDs are seven digits, the identifier space is bounded and enumeration is feasible for a determined attacker.

Root Cause

The root cause is missing team-membership authorization on the project issue endpoint. The application treats knowledge of the issue ID as an implicit access control, which [CWE-425] specifically identifies as insufficient. Issue IDs frequently appear in support tickets, chat channels, dashboards, and screenshots, so they cannot function as secrets. Authorization must be enforced server-side against the requester's team assignments.

Attack Vector

Exploitation requires an authenticated Sentry account within the organization and a known or guessed seven-digit issue ID. The attacker sends a direct request to the issue endpoint referencing the target ID and performs actions such as commenting. No user interaction is required from the legitimate project owners. See the Sentry Weak Authorization Control CVE writeup for reference details.

Detection Methods for CVE-2025-53073

Indicators of Compromise

Comments or state changes on issues authored by users who are not members of the project's team
API access patterns showing sequential or non-sequential enumeration of seven-digit issue IDs
Elevated request volume to /api/0/issues/{id}/ endpoints from a single authenticated account

Detection Strategies

Audit Sentry access logs for cross-project issue interactions initiated by users lacking team membership
Correlate the actor_id on issue comment events with team assignments recorded in the organization membership table
Alert on any single account accessing issues across a large number of unrelated projects within a short window

Monitoring Recommendations

Forward Sentry audit and API logs into a centralized analytics platform for behavioral baselining
Track daily counts of unique projects accessed per user and flag statistical outliers
Monitor for automated scripted access patterns against the issues API, including uniform request timing

How to Mitigate CVE-2025-53073

Immediate Actions Required

Upgrade Sentry self-hosted deployments to a release later than 25.5.1 that includes the authorization fix
Review recent issue comments and state changes across sensitive projects for unauthorized modifications
Rotate or restrict API tokens belonging to accounts that no longer require broad organization access

Patch Information

Refer to the Sentry self-hosted releases page for the fixed version and upgrade instructions. Additional advisory context is available in the Sentry CVE repository folder.

Workarounds

Restrict Sentry organization membership to the minimum set of users required for operations
Place the Sentry instance behind a reverse proxy that enforces additional authorization or rate limiting on issue endpoints
Regularly audit team assignments and remove stale users to reduce the pool of accounts that can abuse the flaw

bash

# Upgrade a self-hosted Sentry deployment to a patched release
cd /path/to/self-hosted
git fetch --tags
git checkout <patched-release-tag>
./install.sh
docker compose up -d