CVE-2026-72688: OpenSignLabs opensignserver - Missing Authentication for Critical Function
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 MASTERKEY-signed file access tokens for any caller-supplied URL without performing any session check, defeating the only access control protecting stored contract files.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72688?
The severity of CVE-2026-72688 is classified as high with a score of 7.5.
What type of vulnerability is CVE-2026-72688?
CVE-2026-72688 is a missing authentication vulnerability in OpenSignLabs opensignserver.
How does CVE-2026-72688 affect security?
CVE-2026-72688 allows an unauthenticated remote attacker to read arbitrary stored documents.
Which versions of OpenSignLabs opensignserver are impacted by CVE-2026-72688?
Versions prior to 2.37.0 of OpenSignLabs opensignserver are impacted by CVE-2026-72688.
How can I remediate CVE-2026-72688?
To remediate CVE-2026-72688, you should upgrade to version 2.37.0 or later of OpenSignLabs opensignserver.