CVEvulnerability
CVE-2026-34840
8.1 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-02
- Last modified
- 2026-10-06
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-347
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 <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.
Affected configurations
• hackerbay oneuptime (< 10.0.42)
Related
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- 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