🛡️ CVE-2026-34840
🟠 CVSS 8.1 — High ⚠️ Exploit Public CWE-347 NVD
8.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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 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.

Details

Severity HIGH
CVSS Score 8.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE CWE-347
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-02
Updated 2026-06-02
Modified 2026-04-13

Affected Packages

Software From version Fixed in
oneuptime — 10.0.42

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