User identifier disclosure via unauthenticated getUserId
Published Aug 11, 2026 · Updated Aug 11, 2026
Information disclosure in OpenSign through 2.37.0 allows remote attackers to obtain internal user objectIds without authentication. The getUserId Parse Cloud function resolves an attacker-supplied email address or username and returns the matching user object's internal identifier without checking request authentication. This permits unauthenticated account enumeration and exposes identifiers that can support targeted follow-on attacks.
Summary
What happened
Information disclosure in OpenSign through 2.37.0 allows remote attackers to obtain internal user objectIds without authentication. The getUserId Parse Cloud function resolves an attacker-supplied email address or username and returns the matching user object's internal identifier without checking request authentication. This permits unauthenticated account enumeration and exposes identifiers that can support targeted follow-on attacks.
The record
- CVE
- CVE-2026-72549
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Vendor
- OpenSignLabs
- Product
- OpenSign
- Classifications
- T1087
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2.37.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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