Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-34840

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.7%
CVSS Severity
CVSS v3 Score 8.1
Products affected by CVE-2026-34840


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