CVE-2026-72549 OpenSignLabs OpenSign - Information Disclosure
Unauthenticated attackers can enumerate user accounts by mapping emails to internal IDs via an unprotected cloud function, facilitating targeted attacks.
- 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-2026-72549?
CVE-2026-72549 is a medium-severity 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 information disclosure vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to map any email address or username to its internal user objectId via the getUserId Parse cloud function. The function performs no authentication before resolving and returning the internal identifier. An attacker can use this to enumerate user accounts and target subsequent attacks.
Weakness: CWE-200
Which versions are affected by CVE-2026-72549?
How do I fix CVE-2026-72549?
No fix has been published for CVE-2026-72549 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-72549 being exploited?
There is no known exploitation of CVE-2026-72549 in the wild and no public exploit code.
Sources
Also known as GHSA-8r4x-jw7g-pvfw.