CVE-2026-5266 Information disclosure in Echo
An attacker can access sensitive notification data via the Echo API, exposing private user information to unauthorized actors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-5266?
CVE-2026-5266 is a low-severity vulnerability in Wikimedia Foundation Echo, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Echo.
This vulnerability is associated with program files includes/Api/ApiEchoNotifications.Php.
This issue affects Echo: from * before 1.43.7, 1.44.4, 1.45.2.
Weakness: CWE-200
Which versions are affected by CVE-2026-5266?
How do I fix CVE-2026-5266?
Upgrade to a fixed version.
Is CVE-2026-5266 being exploited?
There is no known exploitation of CVE-2026-5266 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-5266, GHSA-vmww-wfjj-w6p8, UBUNTU-CVE-2026-5266.