Is CVE-2026-42354 actively exploited?

No active exploitation of CVE-2026-42354 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42354 be exploited remotely?

Yes. CVE-2026-42354 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42354?

CVE-2026-42354 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-42354

CWE-290Published: May 8, 2026· Updated: May 13, 2026

9.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42354 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.