PT-2026-29882 · Oneuptime · Oneuptime

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34840

NVD

CVSS v3.1

8.1

High

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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 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.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-34840

Affected Products

Oneuptime

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-34840 · Security Note
• https://github.com/OneUptime/oneuptime/releases/tag/10.0.42 · Note
• https://github.com/OneUptime/oneuptime/security/advisories/GHSA-5w5c-766x-265g · Note
• https://github.com/OneUptime/oneuptime/commit/2fd7ede52f60444710628d6c1b34dee2ef9e57d1 · Note