CVE-2026-72691
OpenSignLabs opensignserver - Authentication Bypass
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-288 |
| Vendor | opensignlabs |
| Product | opensignserver |
| Published | Aug 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
OpenSignLabs / opensignserver
0 ≤ 2.37.0
Credits
Bobur Abdugafforov (Mahadsec)