CVE-2021-33040: managers/views/iframe.js in FuturePress EPub.js before 0.3.89 allows XSS.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-33040 is a medium-severity flaw (CVSS 6.1) affecting epub.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-01-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: futurepress

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-01-17 17:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

futurepress epub.js UPGRADE

Affected: < 0.3.89

Fixed in: 0.3.89

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls epub.js

2. UPGRADE to 0.3.89

npm install epub.js@">=0.3.89"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-33040?

epub.js: upgrade to 0.3.89. Exact commands for each OS are on this page.

Is CVE-2021-33040 being exploited?

CVE-2021-33040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-33040 affect?

CVE-2021-33040 affects epub.js. Severity is medium (CVSS 6.1). managers/views/iframe.js in FuturePress EPub.js before 0.3.89 allows XSS.

How urgent is CVE-2021-33040?

Priority 37/100. No elevated risk signals yet.

References

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