CVE-2026-72688
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductOpensignlabs Opensignserver
PublishedAug 10, 2026
First seenAug 10, 2026
Weakness typeCWE-306Missing authentication for critical function
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| OpenSignLabs opensignserver | v ≤ 2.37.0 | — |
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