What’s Vulnerable › Vulnerabilities

CVE-2021-3271

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-18 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Pressbooks: through 5.17.3

References

• https://github.com/pressbooks/pressbooks
• https://github.com/pressbooks/pressbooks/pull/2072
• https://www.gosecure.net/blog/2021/02/16/cve-2021-3271-pressbooks-stored-cross-site-scripting-proof-of-concept/
• https://github.com/pressbooks/pressbooks
• https://github.com/pressbooks/pressbooks/pull/2072
• https://www.gosecure.net/blog/2021/02/16/cve-2021-3271-pressbooks-stored-cross-site-scripting-proof-of-concept/

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