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CVE-2026-34840— OneUptime SSO: Multi-Assertion Identity Injection via Decoupled Signature Verification

Quick assessment

Affected
OneUptime oneuptime
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.42之前版本存在数据伪造问题漏洞，该漏洞源于SAML SSO实现中签名验证和身份提取分离，可能导致身份验证绕过。

CVSS 8.1 · High EPSS 0.34% · P26
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I. Basic Information for CVE-2026-34840

Vulnerability Information
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Vulnerability Title
OneUptime SSO: Multi-Assertion Identity Injection via Decoupled Signature Verification
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OneUptime 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.42之前版本存在数据伪造问题漏洞，该漏洞源于SAML SSO实现中签名验证和身份提取分离，可能导致身份验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OneUptime oneuptime < 10.0.42 -

II. Public POCs for CVE-2026-34840

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10469 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-34840

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Patches & Fixes for CVE-2026-34840 (1)

Vendor Advisories for CVE-2026-34840 (1)

Same Patch Batch · OneUptime · 2026-04-02 · 4 CVEs total

CVE-2026-34758 9.1 CRITICAL OneUptime: Missing Authentication on Notification Endpoints
CVE-2026-35053 OneUptime: Unauthenticated Workflow Execution via ManualAPI
CVE-2026-34759 OneUptime: Unauthenticated notification API endpoints - financial abuse via phone number p

IV. Related Vulnerabilities

Same product: oneuptime
Same vendor: OneUptime
Same weakness: CWE-347

V. Comments for CVE-2026-34840

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