What’s Vulnerable › Vulnerabilities

CVE-2021-33040

• Severity: medium (CVSS 6.1 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: none known
• Published: 2022-01-17 · updated 2026-06-17
• Weakness: CWE-79

Description

managers/views/iframe.js in FuturePress EPub.js before 0.3.89 allows XSS.

Affected products

• Futurepress Epub.Js: before 0.3.89 — fixed in 0.3.89

How to fix

Upgrade to a fixed version: Futurepress Epub.Js 0.3.89. Check the vendor advisory for mitigations.

References

• https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
• https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
• https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
• https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
• https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e
• https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89

Get alerted when CVE-2021-33040 or the next vulnerability affects your stack