CVE-2026-72688: CWE-306: Missing Authentication for Critical Function in OpenSignLabs opensignserver
A missing authentication vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read arbitrary stored documents via the fileupload Parse cloud function. The function mints MASTER_KEY-signed file access tokens for any caller-supplied URL without performing any session check, defeating the only access control protecting stored contract files.
AI Analysis
Technical Summary
CVE-2026-72688 describes a missing authentication vulnerability (CWE-306) in OpenSignLabs opensignserver up to version 2.37.0. The fileupload Parse cloud function improperly mints file access tokens signed with the MASTER_KEY for any URL supplied by the caller without performing any session or authentication checks. This flaw allows unauthenticated remote attackers to access and read arbitrary stored contract files, effectively bypassing the intended access control mechanisms.
Potential Impact
An unauthenticated remote attacker can read sensitive stored documents by exploiting the lack of authentication in the fileupload Parse cloud function. This results in a confidentiality breach of stored contract files. The vulnerability does not impact integrity or availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented at this time.
CVE-2026-72688: CWE-306: Missing Authentication for Critical Function in OpenSignLabs opensignserver
Description
A missing authentication vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read arbitrary stored documents via the fileupload Parse cloud function. The function mints MASTER_KEY-signed file access tokens for any caller-supplied URL without performing any session check, defeating the only access control protecting stored contract files.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-72688 describes a missing authentication vulnerability (CWE-306) in OpenSignLabs opensignserver up to version 2.37.0. The fileupload Parse cloud function improperly mints file access tokens signed with the MASTER_KEY for any URL supplied by the caller without performing any session or authentication checks. This flaw allows unauthenticated remote attackers to access and read arbitrary stored contract files, effectively bypassing the intended access control mechanisms.
Potential Impact
An unauthenticated remote attacker can read sensitive stored documents by exploiting the lack of authentication in the fileupload Parse cloud function. This results in a confidentiality breach of stored contract files. The vulnerability does not impact integrity or availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TuranSec
- Date Reserved
- 2026-08-10T11:55:39.470Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a79c3abbf8831d539a74102
Added to database: 08/10/2026, 12:27:23 UTC
Last enriched: 08/10/2026, 12:41:34 UTC
Last updated: 08/10/2026, 18:42:03 UTC
Views: 7
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.