CVE-2026-72689 OpenSignLabs opensignserver - Broken Object Level Authorization
Unauthenticated attackers can read full contract records and PII via a cloud function that bypasses access controls when OTP is disabled.
- 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-2026-72689?
CVE-2026-72689 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 broken object-level authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read complete contract records via the getDocument Parse cloud function. The function fetches documents using useMasterKey, bypassing the object ACL, and returns full records including sender and signer PII and a pre-signed document download URL whenever the document's IsEnableOTP flag is unset, which is the default configuration.
Weakness: CWE-639
Which versions are affected by CVE-2026-72689?
How do I fix CVE-2026-72689?
No fix has been published for CVE-2026-72689 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-2026-72689 being exploited?
There is no known exploitation of CVE-2026-72689 in the wild and no public exploit code.
Sources
Also known as GHSA-mgm4-2355-58g4.