Vulnerability · Published Aug 10, 2026 · Assigned by TuranSec

CVE-2026-72689OpenSignLabs opensignserver - Broken Object Level Authorization

High 7.5

In plain English

A high-severity authorization bypass via user-controlled key in opensignserver from OpenSignLabs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 55.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
OpenSignLabs	opensignserver	0 – through 2.37.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

OpenSign GitHub Repository third-party-advisory