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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/OneUptime/oneuptime/commit/2fd7ede52f60444710628d6c1b34dee2ef9e57d1	Patch
https://github.com/OneUptime/oneuptime/releases/tag/10.0.42	Product Release Notes
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-5w5c-766x-265g	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:hackerbay:oneuptime:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-02 20:16

Updated : 2026-07-24 21:10

NVD link : CVE-2026-34840

Mitre link : CVE-2026-34840

CVE.ORG link : CVE-2026-34840

JSON object : View

Products Affected

hackerbay

oneuptime

CWE

CWE-347

Improper Verification of Cryptographic Signature

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