OpenSignLabs opensignserver - Missing Authentication for Critical Function (CVE-2026-72688) | HOL Guard CVE

High · CVSS 7.5CVE-2026-72688

OpenSignLabs opensignserver - Missing Authentication for Critical Function

Answer in brief

CVE-2026-72688 records a High severity (CVSS 7.5) vulnerability in OpenSignLabs opensignserver - Missing Authentication for Critical Function. The current sources do not mark it as known exploited. The current feed maps OpenSignLabs/opensignserver (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Aug 26, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenSignLabs/opensignserver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
OpenSignLabs/opensignservergeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for OpenSignLabs/opensignserver.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.