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CVE-2026-72549— OpenSignLabs OpenSign - Information Disclosure

Quick assessment

Affected
OpenSignLabs OpenSign
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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及之前版本存在信息泄露漏洞，该漏洞源于getUserId Parse云函数在解析并返回内部标识前未进行身份验证，可能导致未经身份验证的远程攻击者将任意电子邮件地址或用户名映射到内部用户objectId，从而枚举用户账户并针对后续攻击。

CVSS 5.3 · Medium EPSS 0.48% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenSignLabs OpenSign ≤ 2.37.0 affected
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I. Basic Information for CVE-2026-72549

Vulnerability Information
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Vulnerability Title
OpenSignLabs OpenSign - Information Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
An information disclosure vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to map any email address or username to its internal user objectId via the getUserId Parse cloud function. The function performs no authentication before resolving and returning the internal identifier. An attacker can use this to enumerate user accounts and target subsequent attacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSignLabs OpenSign 信息泄露漏洞
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及之前版本存在信息泄露漏洞，该漏洞源于getUserId Parse云函数在解析并返回内部标识前未进行身份验证，可能导致未经身份验证的远程攻击者将任意电子邮件地址或用户名映射到内部用户objectId，从而枚举用户账户并针对后续攻击。
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-2026-72549

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III. Intelligence Information for CVE-2026-72549

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Vendor Pages for CVE-2026-72549 (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-2026-72544 7.5 HIGH OpenSignLabs OpenSign - Insufficient Verification of Data Authenticity

IV. Related Vulnerabilities

Same product: OpenSign
Same vendor: OpenSignLabs
Same weakness: CWE-200

V. Comments for CVE-2026-72549

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