CVE-2024-21911: TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability

Q: How do I fix CVE-2024-21911?

tinymce: upgrade to 5.6.0. Exact commands for each OS are on this page.

Q: Is CVE-2024-21911 being exploited?

CVE-2024-21911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-21911 affect?

CVE-2024-21911 affects tinymce. Severity is medium (CVSS 6.1). TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browse

Q: How urgent is CVE-2024-21911?

Priority 43/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2024-21911 is a medium-severity flaw (CVSS 6.1) affecting tinymce. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browser.

Why this priority

Public exploit reference

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	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-01-03
Last modified	2026-07-14

Publisher (CNA): VulnCheck · Vendor: tiny

Last updated 2026-07-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-03 16:15 UTCPublished CVE record published
2026-07-14 23:17 UTCUpdated Record last modified

tiny tinymce UPGRADE

Affected: < 5.6.0

Fixed in: 5.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tinymce || rpm -q tinymce || tinymce --version

2. UPGRADE to 5.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tinymce

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tinymce

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2024-21911?

tinymce: upgrade to 5.6.0. Exact commands for each OS are on this page.

Is CVE-2024-21911 being exploited?

CVE-2024-21911 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-2024-21911 affect?

CVE-2024-21911 affects tinymce. Severity is medium (CVSS 6.1). TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browse

How urgent is CVE-2024-21911?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2026-47759 HIGH 8.7 UPGRADE TinyMCE is an open source rich text editor
CVE-2026-47762 HIGH 8.7 UPGRADE TinyMCE is an open source rich text editor
CVE-2026-47761 HIGH 8.7 UPGRADE TinyMCE is an open source rich text editor
CVE-2026-47760 HIGH 8.7 UPGRADE TinyMCE is an open source rich text editor
CVE-2024-21910 MEDIUM 6.1 UPGRADE TinyMCE versions before 5.10.0 are affected by a cross-site scripting vulnerability

References

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