CVE-2026-11354 Missing authorization in Participants Database

Medium 5.3 Published 24 Jul 2026 Updated 24 Jul 2026

Unauthenticated attackers can overwrite arbitrary participant records and steal sensitive personal information by manipulating the ID parameter in the Participants Database plugin.

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-2026-11354?

CVE-2026-11354 is a medium-severity missing authorization vulnerability in xnau Participants Database, published on 24 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Participants Database plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.7.8.3 via the 'id' parameter. This makes it possible for unauthenticated attackers to overwrite arbitrary participant records by numeric ID and redirect the private_id-bearing record-access link to an attacker-controlled email address, granting full read and edit access to the victim's stored personally identifiable information including names, email addresses, phone numbers, and any other fields collected in the participant database. An attacker can harvest a valid nonce with a plain unauthenticated GET request to any page rendering the public signup or record form, then POST action=update with an arbitrary id value to overwrite any record; chaining a subsequent action=retrieve then delivers the private-access link to the attacker-controlled mailbox.

Weakness: CWE-862

Which versions are affected by CVE-2026-11354?

How do I fix CVE-2026-11354?

No fix has been published for CVE-2026-11354 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-2026-11354 being exploited?

There is no known exploitation of CVE-2026-11354 in the wild and no public exploit code.

Sources

Also known as GHSA-jjqh-m423-q994.