Security Advisory

CVE-2026-34840

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-02 18:52:48

Last updated 2026-04-02 20:20:13

Assigner GitHub_M

State PUBLISHED

Description

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptimes 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.

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