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TI-2026-21634 Aliases CVE-2026-27197GHSA-ggmg-cqg6-j45g

Sentry: Improper Authentication on SAML SSO process allows user identity linking

Priority MEDIUM 42CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

Sentry is a developer-first error tracking and performance monitoring tool. Versions 21.12.0 through 26.1.0 have a critical vulnerability in its SAML SSO implementation which allows an attacker to take over any user account by using a malicious SAML Identity Provider and another organization on the same Sentry instance. Self-hosted users are only at risk if the following criteria is met: ore than one organizations are configured (SENTRY_SINGLE_ORGANIZATION = True), or malicious user has existing access and permissions to modify SSO settings for another organization in a multo-organization instance. This issue has been fixed in version 26.2.0. To workaround this issue, implement user account-based two-factor authentication to prevent an attacker from being able to complete authentication with a victim's user account. Organization administrators cannot do this on a user's behalf, this requires individual users to ensure 2FA has been enabled for their account.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00494 42nd percentileScored 2026-11-07
Fix Fixed sentry (getsentry): 26.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getsentrysentry21.12.0 to before 26.2.026.2.0Patch availableCNA
—sentry (PyPI)21.12.0 and later—No fix listedGHSA-ggmg-cqg6-j45g
  • sentry Vendorgetsentry Affected 21.12.0 to before 26.2.0 Fixed in 26.2.0 Patch available CNA
  • sentry (PyPI) Vendor— Affected 21.12.0 and later Fixed in — No fix listed GHSA-ggmg-cqg6-j45g

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sentry:sentry:*:*:*:*:*:*:*:*21.12.0 to before 26.2.0VulnerableSentry
  • cpe:2.3:a:sentry:sentry:*:*:*:*:*:*:*:* Versions 21.12.0 to before 26.2.0 Vulnerable ·Sentry

Remediation

  • Fix · CNA sentry (getsentry) Fixed in 26.2.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27197
  2. 2026-10-03 Alias added: GHSA-ggmg-cqg6-j45g
  3. 2026-10-19 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 2

Other 2

  • TI-2026-21018 Sentry allows unauthorized access to event data across organizational boundaries CVSS 4.0MEDIUM 5.7
  • TI-2026-30656 Sentry: Improper authentication on SAML SSO process allows user identity linking CVSS 3.1CRITICAL 9.8
  • TI-2026-78982 Sentry-Javascript: Middleware Bypass when using Tunnel route CVSS 4.0CRITICAL 9.1
  • TI-2025-16094 Improper authentication on SAML SSO process allows user impersonation in sentry CVSS 3.1CRITICAL 9.1
  • TI-2023-25212 Sentry Next.js vulnerable to SSRF via Next.js SDK tunnel endpoint CVSS 3.1CRITICAL 9.3
  • TI-2026-37904 Sentry: Inefficient Regular Expression Complexity in sentry CVSS 3.1HIGH 7.5
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences