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CVE-2026-72692— OpenSignLabs opensignserver - Missing Authorization

Quick assessment

Affected
OpenSignLabs opensignserver
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.

OpenSignLabs OpenSign是OpenSignLabs组织的一款数字文档签名解决方案。 OpenSignLabs OpenSign 2.37.0及之前版本存在授权问题漏洞，该漏洞源于缺少授权验证，通过declinedoc Parse云函数写入IsDeclined、DeclineReason和调用者提供的DeclineBy指针时未验证调用者身份，可能导致未认证的远程攻击者不可逆地拒绝任何正在处理的文档，并伪造任意用户的拒绝归属，造成工作流终止和证据记录伪造。

CVSS 7.5 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSignLabs opensignserver ≤ 2.37.0 affected
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I. Basic Information for CVE-2026-72692

Vulnerability Information
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Vulnerability Title
OpenSignLabs opensignserver - Missing Authorization
Source: CVE Program / CVE List V5
Vulnerability Description
A missing authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to irreversibly decline any in-flight document and forge the decline attribution to an arbitrary user via the declinedoc Parse cloud function. The function writes IsDeclined, DeclineReason, and a caller-supplied DeclineBy pointer without verifying the caller's identity, enabling workflow termination and evidentiary record falsification against any accessible document.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSignLabs OpenSign 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSignLabs OpenSign是OpenSignLabs组织的一款数字文档签名解决方案。 OpenSignLabs OpenSign 2.37.0及之前版本存在授权问题漏洞，该漏洞源于缺少授权验证，通过declinedoc Parse云函数写入IsDeclined、DeclineReason和调用者提供的DeclineBy指针时未验证调用者身份，可能导致未认证的远程攻击者不可逆地拒绝任何正在处理的文档，并伪造任意用户的拒绝归属，造成工作流终止和证据记录伪造。
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
OpenSignLabs opensignserver 0 ~ 2.37.0 -

II. Public POCs for CVE-2026-72692

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 7529 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-72692

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Vendor Pages for CVE-2026-72692 (1)

Same Patch Batch · OpenSignLabs · 2026-08-10 · 4 CVEs total

CVE-2026-72688 7.5 HIGH OpenSignLabs opensignserver - Missing Authentication for Critical Function
CVE-2026-72691 7.5 HIGH OpenSignLabs opensignserver - Authentication Bypass
CVE-2026-72689 7.5 HIGH OpenSignLabs opensignserver - Broken Object Level Authorization

IV. Related Vulnerabilities

Same product: opensignserver
Same vendor: OpenSignLabs
Same weakness: CWE-862

V. Comments for CVE-2026-72692

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