CVE-2026-72545 OpenSignLabs OpenSign - Insecure Direct Object Reference
Unauthenticated attackers can modify any contact record in OpenSign due to missing authorization checks in the updatecontacttour 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-2026-72545?
CVE-2026-72545 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 write to any contact record via the updatecontacttour Parse cloud function. The function performs no authentication or authorization before updating the target contact record. An attacker can corrupt or overwrite contact data for any user in the system without credentials.
Weakness: CWE-639
Which versions are affected by CVE-2026-72545?
How do I fix CVE-2026-72545?
No fix has been published for CVE-2026-72545 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-2026-72545 being exploited?
There is no known exploitation of CVE-2026-72545 in the wild and no public exploit code.
Sources
Also known as GHSA-4vpg-x7mh-3947.