CVE-2026-72691
OpenSignLabs opensignserver - Authentication Bypass
- State
- Published
- Severity
- 7.5 High
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Reserved
- Aug 10, 2026
Description
An authentication bypass vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to mint MASTER_KEY-signed file access tokens for arbitrary stored files via the getsignedurl Parse cloud function. The function skips its isAuthenticated check whenever any docId parameter is supplied, even one corresponding to no real document, allowing the authentication gate to be bypassed by supplying an arbitrary string as docId.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | TuranSec |
Weaknesses
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
Affected Products
| Product | Versions |
|---|---|
opensignserverOpenSignLabs |
|
References
- OpenSign GitHub Repositorythird-party-advisory
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