CVE-2021-33570: Postbird Project Postbird

Medium severity, CVSS 5.4. EPSS: 3.6% chance of exploitation in the next 30 days.

Postbird 0.8.4 allows stored XSS via the onerror attribute of an IMG element in any PostgreSQL database table. This can result in reading local files via vectors involving XMLHttpRequest and open of a file:/// URL, or discovering PostgreSQL passwords via vectors involving Window.localStorage and savedConnections.

Affected products

Published 2021-05-25. Last modified 2026-06-17.