CVE-2026-72543 OpenSignLabs OpenSign - Insecure Direct Object Reference
Unauthenticated attackers can retrieve any contact record including PII via the getcontact function due to missing authorization checks.
- 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-2026-72543?
CVE-2026-72543 is a high-severity missing authorization vulnerability in OpenSignLabs OpenSign, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to retrieve any contact record via the getcontact Parse cloud function. The function executes with useMasterKey and performs no authentication or authorization checks before returning the requested contact object. An attacker can enumerate and read all contact records including personally identifiable information without credentials.
Weakness: CWE-639
Which versions are affected by CVE-2026-72543?
How do I fix CVE-2026-72543?
No fix has been published for CVE-2026-72543 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-2026-72543 being exploited?
There is no known exploitation of CVE-2026-72543 in the wild and no public exploit code.
Sources
Also known as GHSA-89m8-qpv9-7q8g.