Quick answers
- Is CVE-2026-72543 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-72543 being exploited in the wild.
- How severe is CVE-2026-72543?
- High severity, with a CVSS score of 7.5, published 11 August 2026.
- Which products and versions are affected?
- OpenSignLabs OpenSign through 2.37.0.
- Is there a fix for CVE-2026-72543?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-72543 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-72543?
- Check whether you run OpenSignLabs OpenSign at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an insecure direct object reference (IDOR) in the getcontact Parse cloud function. The function executes with master-level privileges (useMasterKey) but performs no authentication or authorization checks before returning requested contact objects. Because the function is accessible over the network and requires no credentials, an unauthenticated remote attacker can enumerate contact IDs and retrieve any record. The vulnerability affects OpenSign through version 2.37.0; patched versions or configuration mitigations should be applied.
Affected products
- OpenSignLabs OpenSign through 2.37.0
Timeline
- 2026-08-11: disclosed