What’s Vulnerable › Vulnerabilities

CVE-2024-21908: Cross-site scripting vulnerability in TinyMCE

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-03 · updated 2026-07-14
• Weakness: CWE-79

Description

TinyMCE versions before 5.9.0 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.

Affected products

• tinymce: before 5.9.0 — fixed in 5.9.0

How to fix

Upgrade to a fixed version: tinymce 5.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/advisories/GHSA-5h9g-x5rv-25wg
• https://github.com/tinymce/tinymce/security/advisories/GHSA-5h9g-x5rv-25wg
• https://vulncheck.com/advisories/vc-advisory-GHSA-5h9g-x5rv-25wg
• https://www.tiny.cloud/docs/release-notes/release-notes59/#securityfixes
• https://github.com/advisories/GHSA-5h9g-x5rv-25wg
• https://github.com/tinymce/tinymce/security/advisories/GHSA-5h9g-x5rv-25wg
• https://vulncheck.com/advisories/vc-advisory-GHSA-5h9g-x5rv-25wg
• https://www.tiny.cloud/docs/release-notes/release-notes59/#securityfixes

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