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VulnerabilityPublished Updated

CVE-2026-42354: getsentry sentry · Authentication Bypass by Spoofing

Affects getsentry sentrySource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical : upgrade to 26.4.1 as a priority.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 26.4.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade sentry and getsentry/sentry to 26.4.1.

Affected software

ProductAffectedFixed in
getsentrysentryAffected
  • >=21.12.0 <26.4.1
Fixed in
  • 26.4.1
GitHubgetsentry/sentrypkg:github/getsentry/sentryOther threatsAffected
  • >=21.12.0 <26.4.1
Fixed in
  • 26.4.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Sentry to version 26.4.1 or later, where this vulnerability has been patched. Since this is an on-premises product, administrators must apply the update manually. Patch status is confirmed by the vendor advisory stating the fix is included in version 26.4.1. No other mitigations are indicated.

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.

References

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