CVE-2026-34840

HighCVSS 8.1/10Last modified Oct 6, 2026

Description

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts) has decoupled signature verification and identity extraction. isSignatureValid() verifies the first <Signature> element in the XML DOM using xml-crypto, while getEmail() always reads from assertion[0] via xml2js. An attacker can prepend an unsigned assertion containing an arbitrary identity before a legitimately signed assertion, resulting in authentication bypass. This issue has been patched in version 10.0.42.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-347

Affected software

VendorProductVersions
OneUptimeoneuptime< 10.0.42

References

Timeline

Published
Apr 2, 2026
Last modified
Oct 6, 2026
NVD status
Analyzed

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CVE-2026-34840: High severity, CVSS 8.1 | Vulnix