CVE-2026-72688 OpenSignLabs opensignserver - Missing Authentication for Critical Function
Unauthenticated attackers can read arbitrary stored documents by exploiting a missing authentication check in the fileupload Parse cloud function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-72688?
CVE-2026-72688 is a high-severity missing authorization vulnerability in OpenSignLabs opensignserver, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-72688?
How do I fix CVE-2026-72688?
No fix has been published for CVE-2026-72688 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72688 being exploited?
There is no known exploitation of CVE-2026-72688 in the wild and no public exploit code.
Sources
Also known as GHSA-jppp-j33j-6m5q.