CVE-2021-3271

Name: CVE-2021-3271
Creator: NVD / NIST
Published: 2021-02-18T19:15:13.273+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.93%

Last modified Jun 17, 2026

CVE-2021-3271 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.93%

56.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Pressbooks	Pressbooks	<= 5.17.3

References

https://github.com/pressbooks/pressbooksThird Party Advisory
https://github.com/pressbooks/pressbooks/pull/2072Exploit, Third Party Advisory
https://www.gosecure.net/blog/2021/02/16/cve-2021-3271-pressbooks-stored-cross-site-scripting-proof-of-concept/Exploit, Third Party Advisory
https://github.com/pressbooks/pressbooksThird Party Advisory
https://github.com/pressbooks/pressbooks/pull/2072Exploit, Third Party Advisory
https://www.gosecure.net/blog/2021/02/16/cve-2021-3271-pressbooks-stored-cross-site-scripting-proof-of-concept/Exploit, Third Party Advisory

Timeline

Published: Feb 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3271?

How severe is CVE-2021-3271?

CVE-2021-3271 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3271?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3271?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST