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CVE-2026-42354— Sentry: Improper authentication on SAML SSO process allows user identity linking

Quick assessment

Affected
getsentry sentry
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sentry是Sentry开源的一个面向开发人员的错误跟踪和性能监控平台。 Sentry 21.12.0版本至26.4.1之前版本存在安全漏洞，该漏洞源于SAML SSO实现问题，可能导致攻击者通过恶意SAML身份提供商接管用户账户。

CVSS 9.1 · Critical EPSS 0.73% · P53

Affected Version Matrix 1

VendorProduct Version RangeStatus
getsentry sentry >= 21.12.0, < 26.4.1 affected
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I. Basic Information for CVE-2026-42354

Vulnerability Information
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Vulnerability Title
Sentry: Improper authentication on SAML SSO process allows user identity linking
Source: CVE Program / CVE List V5
Vulnerability Description
Sentry is an error tracking and performance monitoring tool. From version 21.12.0 to before version 26.4.1, a critical vulnerability was discovered in the SAML SSO implementation of Sentry. The vulnerability allows an attacker to take over any user account by using a malicious SAML Identity Provider and another organization on the same Sentry instance. The victim email address must be known in order to exploit this vulnerability. This issue has been patched in version 26.4.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Sentry 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sentry是Sentry开源的一个面向开发人员的错误跟踪和性能监控平台。 Sentry 21.12.0版本至26.4.1之前版本存在安全漏洞，该漏洞源于SAML SSO实现问题，可能导致攻击者通过恶意SAML身份提供商接管用户账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getsentry sentry >= 21.12.0, < 26.4.1 -

II. Public POCs for CVE-2026-42354

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III. Intelligence Information for CVE-2026-42354

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Patches & Fixes for CVE-2026-42354 (2)

Vendor Advisories for CVE-2026-42354 (1)

IV. Related Vulnerabilities

Same product: sentry
Same vendor: getsentry
Same weakness: CWE-290

V. Comments for CVE-2026-42354

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