---
title: "CVE-2026-27197: Sentry: Improper authentication on SAML SSO process allows user identity linking"
url: https://erroneo.us/security/cve/CVE-2026-27197/
description: "CVE-2026-27197 (sentry (PyPI)): Sentry is a developer-first error tracking and performance monitoring tool. Versions 21.12.0 through 26.1.0 have a critical…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-21
date_modified: 2026-04-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27197"
kev: false
cvss: 9.1
epss: 0.00651
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-27197: Sentry: Improper authentication on SAML SSO process allows user identity linking

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes sentry (PyPI) >= 21.12.0, < 26.2.0, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

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 (SENTRYSINGLEORGANIZATION = 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.

## Affected packages

- PyPI `sentry` >= 21.12.0, < 26.2.0 → fixed: none listed

## Affected products (CVE record)

- getsentry sentry: >= 21.12.0, < 26.2.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [GitHub Advisory GHSA-ggmg-cqg6-j45g](https://github.com/advisories/GHSA-ggmg-cqg6-j45g)
- [CVE.org record CVE-2026-27197](https://www.cve.org/CVERecord?id=CVE-2026-27197)
- [NVD entry CVE-2026-27197](https://nvd.nist.gov/vuln/detail/CVE-2026-27197)
- [github.com](https://github.com/getsentry/sentry/security/advisories/GHSA-ggmg-cqg6-j45g)
- [github.com](https://github.com/getsentry/sentry/pull/108458)

---
Source page: https://erroneo.us/security/cve/CVE-2026-27197/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt