CVE-2021-3271: Pressbooks

Medium severity, CVSS 4.8. EPSS: 0.9% chance of exploitation in the next 30 days.

PressBooks 5.17.3 contains a cross-site scripting (XSS). Stored XSS can be submitted via the Book Info's Long Description Body, and all actions to open or preview the books page will result in the triggering the stored XSS.

Affected products

• Pressbooks Pressbooks: up to and including 5.17.3

Published 2021-02-18. Last modified 2026-06-17.