Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

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

CVSS 8.1 · High EPSS 0.07% · P21
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-34840

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OneUptime SSO: Multi-Assertion Identity Injection via Decoupled Signature Verification
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
OneUptimeoneuptime < 10.0.42 -

II. Public POCs for CVE-2026-34840

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 10433 chars
Paid plan includes:
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-34840

请登录查看更多情报信息。

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

CVE-2026-347589.1 CRITICALOneUptime: Missing Authentication on Notification Endpoints
CVE-2026-35053OneUptime: Unauthenticated Workflow Execution via ManualAPI
CVE-2026-34759OneUptime: 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

No comments yet

Leave a comment