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CVE-2026-72544— OpenSignLabs OpenSign - Insufficient Verification of Data Authenticity

Quick assessment

Affected
OpenSignLabs OpenSign
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及之前版本存在输入验证错误漏洞，该漏洞源于triggerevent Parse云函数在未进行身份验证的情况下接受调用者提供的查看者身份和IP地址参数，允许伪造任意审计日志条目，导致攻击者可以篡改任何签名文档的法律审计跟踪，破坏不可否认性。

CVSS 7.5 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1565.001 · Stored Data Manipulation

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSignLabs OpenSign ≤ 2.37.0 affected
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I. Basic Information for CVE-2026-72544

Vulnerability Information
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Vulnerability Title
OpenSignLabs OpenSign - Insufficient Verification of Data Authenticity
Source: CVE Program / CVE List V5
Vulnerability Description
An integrity verification vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to forge document audit-trail entries via the triggerevent Parse cloud function. The function accepts viewer identity and IP address as caller-supplied parameters without authentication, allowing fabrication of arbitrary audit log entries. An attacker can tamper with the legal audit trail of any signed document, undermining non-repudiation.
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
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSignLabs OpenSign 输入验证错误漏洞
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及之前版本存在输入验证错误漏洞，该漏洞源于triggerevent Parse云函数在未进行身份验证的情况下接受调用者提供的查看者身份和IP地址参数，允许伪造任意审计日志条目，导致攻击者可以篡改任何签名文档的法律审计跟踪，破坏不可否认性。
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 OpenSign 0 ~ 2.37.0 -

II. Public POCs for CVE-2026-72544

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10240 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-2026-72544

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Vendor Pages for CVE-2026-72544 (1)

Same Patch Batch · OpenSignLabs · 2026-08-11 · 5 CVEs total

CVE-2026-72548 7.5 HIGH OpenSignLabs OpenSign - Information Disclosure
CVE-2026-72545 7.5 HIGH OpenSignLabs OpenSign - Insecure Direct Object Reference
CVE-2026-72543 7.5 HIGH OpenSignLabs OpenSign - Insecure Direct Object Reference
CVE-2026-72549 5.3 MEDIUM OpenSignLabs OpenSign - Information Disclosure

IV. Related Vulnerabilities

Same product: OpenSign
Same vendor: OpenSignLabs
Same weakness: CWE-345

V. Comments for CVE-2026-72544

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