What is CVE-2026-72543?

CVE-2026-72543 is a high-severity vulnerability in Opensignlabs Opensign, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-11.

How severe is CVE-2026-72543?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Opensignlabs Opensign

CVE-2026-72543

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 useMasterK…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Opensignlabs Opensign — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Frequently asked questions

What is CVE-2026-72543?: CVE-2026-72543 is a high-severity vulnerability in Opensignlabs Opensign, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-08-11.
How severe is CVE-2026-72543?: High severity. CVSS v3 base score is 7.5 out of 10.