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Vulnerability record · CVE-2026-72688 · published 10 August 2026

CVE-2026-72688: Missing authentication for critical function vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.61% · top 52.9% CWE-306 · Missing authentication for critical function Deferred
7.5CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
26 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://github.com/OpenSignLabs/OpenSign

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Source: NIST National Vulnerability Database (record CVE-2026-72688), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.