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CVE-2026-72543— OpenSignLabs OpenSign - Insecure Direct Object Reference

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及之前版本存在授权问题漏洞，该漏洞源于不安全的直接对象引用，未经身份验证的远程攻击者可通过getcontact Parse云函数检索任意联系记录，导致包含个人身份信息的联系记录泄露。

CVSS 7.5 · High EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSignLabs OpenSign ≤ 2.37.0 affected
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I. Basic Information for CVE-2026-72543

Vulnerability Information
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Vulnerability Title
OpenSignLabs OpenSign - Insecure Direct Object Reference
Source: CVE Program / CVE List V5
Vulnerability Description
An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to retrieve any contact record via the getcontact Parse cloud function. The function executes with useMasterKey and performs no authentication or authorization checks before returning the requested contact object. An attacker can enumerate and read all contact records including personally identifiable information without credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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，该漏洞源于不安全的直接对象引用，未经身份验证的远程攻击者可通过getcontact Parse云函数检索任意联系记录，导致包含个人身份信息的联系记录泄露。
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-2026-72543

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8198 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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POC zip download
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III. Intelligence Information for CVE-2026-72543

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Vendor Pages for CVE-2026-72543 (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-2026-72544 7.5 HIGH OpenSignLabs OpenSign - Insufficient Verification of Data Authenticity
CVE-2026-72549 5.3 MEDIUM OpenSignLabs OpenSign - Information Disclosure

IV. Related Vulnerabilities

Same product: OpenSign
Same vendor: OpenSignLabs
Same weakness: CWE-639

V. Comments for CVE-2026-72543

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