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CVE-2026-102899: Sentry: Improper authentication on SAML SSO process allows user identity linking

• Severity: high (CVSS 7.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-287

Description

Sentry is an application monitoring and error tracking platform. From 26.5.0 until 26.7.2, the SAML SSO identity-linking flow allows an attacker who controls a SAML identity provider to socially engineer an authenticated user into opening a malicious URL, link the attacker's identity to the victim's Sentry account, and take control of that account. The attack requires a browser that accepts the cross-site cookie context, including Firefox with SameSite=None cookies or Chromium with third-party cookies enabled. Sentry SaaS received the remediation on July 27, 2026, and self-hosted Sentry is fixed in version 26.7.2.

Affected products

• getsentry sentry: from 26.5.0, < 26.7.2

References

• https://github.com/getsentry/self-hosted/releases/tag/26.7.2
• https://github.com/getsentry/sentry/commit/9c982d4bcb81c93e2db552084bcbb45cdd34bdd3
• https://github.com/getsentry/sentry/commit/ec963de4ec8c7f340f286c6f613e55458a9e5ddf
• https://github.com/getsentry/sentry/pull/120467
• https://github.com/getsentry/sentry/pull/120702
• https://github.com/getsentry/sentry/releases/tag/26.7.2
• https://github.com/getsentry/sentry/security/advisories/GHSA-w699-8wff-fqxw

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