Description

An Authentication Bypass vulnerability in Sentry before R10.8.2, R10.7.3 and R10.6.4 allows a remote unauthenticated attacker to gain administrative level access.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.1",
  "pubDate": "2026-09-08T15:18:51.130Z",
  "pubdate": "2026-09-08T15:18:51.130Z",
  "executiveSummary": "This vulnerability is an authentication bypass flaw affecting Sentry versions prior to R10.8.2, R10.7.3, and R10.6.4.\nThe vulnerability permits an unauthenticated, remote attacker to circumvent standard security controls and gain administrative-level access to the affected Sentry instance.\nBy bypassing the authentication mechanism, an unauthorized party can fully compromise the application, leading to complete loss of confidentiality, integrity, and availability of the data managed within the Sentry environment.\nThe risk is considered critical, as it requires no prior credentials or valid user accounts to initiate an exploit. The exposure is entirely network-based, meaning any instance accessible over a network is susceptible to immediate takeover.\nSuccessful exploitation results in full administrative control, allowing the attacker to perform any action available to an authorized superuser, including data exfiltration, configuration modification, and further lateral movement within the network infrastructure.\nOrganizations relying on these specific Sentry versions are at significant risk of unauthorized access and must prioritize immediate patching or remediation.",
  "technicalDetails": "The vulnerability resides within the authentication framework of Sentry, specifically in the mechanisms designed to validate and authorize session tokens or requests originating from external entities.\nThe root cause is a failure in the security logic that verifies identity, allowing an unauthenticated request to be processed as if it originated from a verified administrative session.\nBecause the system incorrectly identifies the incoming request as authenticated, the underlying security layers that typically restrict access to administrative endpoints are rendered ineffective.\nThe attack flow begins with a remote, unauthenticated attacker sending a crafted request to the Sentry instance. This request is designed to manipulate or bypass the identity verification flow, likely by targeting specific headers, parameters, or endpoints that are improperly protected against unauthorized access.\nOnce the initial request bypasses the authorization gate, the Sentry application treats the interaction as a session with high-privilege administrative rights. This permits the attacker to bypass the intended authentication requirements entirely.\nThe exploitation does not require pre-existing user accounts or specific credentials. It is a direct exploit against the session management or access control logic of the application.\nAffected versions include any deployment of Sentry prior to the release of R10.8.2, R10.7.3, and R10.6.4. Systems remaining on these older versions maintain a persistent, exploitable state for any attacker capable of reaching the network-exposed management interface.\nPost-exploitation, the attacker operates with full administrative privileges. This includes the ability to modify project configurations, view sensitive error logs, extract environment variables, API keys, and stack traces that may contain sensitive PII or credentials, and potentially use the administrative access to execute code or further exploit the server infrastructure.\nThe flaw suggests a fundamental defect in the middleware or security component responsible for request authentication, which fails to enforce strict authorization checks on sensitive endpoints."
}