# CVE-2024-21911: Cross-site scripting vulnerability in TinyMCE

Status: published. Published: 2024-01-03. Updated: 2026-11-08.

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.

## Remediation

- fix: tinymce (npm): OSV reports a fixed version 5.6.0. Check the advisory for supported release branches. (source: OSV GHSA-w7jx-j77m-wp65) — https://github.com/advisories/GHSA-w7jx-j77m-wp65
- fix: TinyMCE (NuGet): OSV reports a fixed version 5.6.0. Check the advisory for supported release branches. (source: OSV GHSA-w7jx-j77m-wp65) — https://github.com/advisories/GHSA-w7jx-j77m-wp65
- fix: tinymce/tinymce (Packagist): OSV reports a fixed version 5.6.0. Check the advisory for supported release branches. (source: OSV GHSA-w7jx-j77m-wp65) — https://github.com/advisories/GHSA-w7jx-j77m-wp65

## Affected products and versions

-  /  (TinyMCE): ≥ 0; < 5.6.0 (affected, semver 2.0.0). Source: CNA: VulnCheck
-  / tinymce (tinymce): ≥ 0; < 5.6.0 (affected, semver); OSV events: introduced 0; fixed 5.6.0. Source: OSV GHSA-w7jx-j77m-wp65
-  / TinyMCE (TinyMCE): 3.4.3.2 (affected, NuGet); 3.4.4 (affected, NuGet); 3.4.5 (affected, NuGet); 3.4.7 (affected, NuGet); 3.5.0 (affected, NuGet); 3.5.0.1 (affected, NuGet); 3.5.1 (affected, NuGet); 3.5.1.1 (affected, NuGet); 3.5.2 (affected, NuGet); 3.5.3 (affected, NuGet); 3.5.4 (affected, NuGet); 3.5.4.1 (affected, NuGet); 3.5.5 (affected, NuGet); 3.5.6 (affected, NuGet); 3.5.7 (affected, NuGet); 3.5.8 (affected, NuGet); 4.0.0 (affected, NuGet); 4.0.1 (affected, NuGet); 4.0.10 (affected, NuGet); 4.0.11 (affected, NuGet); 4.0.13 (affected, NuGet); 4.0.14 (affected, NuGet); 4.0.15 (affected, NuGet); 4.0.16 (affected, NuGet); 4.0.17 (affected, NuGet); 4.0.18 (affected, NuGet); 4.0.19 (affected, NuGet); 4.0.2 (affected, NuGet); 4.0.20 (affected, NuGet); 4.0.21 (affected, NuGet); 4.0.22 (affected, NuGet); 4.0.23 (affected, NuGet); 4.0.24 (affected, NuGet); 4.0.25 (affected, NuGet); 4.0.26 (affected, NuGet); 4.0.27 (affected, NuGet); 4.0.28 (affected, NuGet); 4.0.4 (affected, NuGet); 4.0.5 (affected, NuGet); 4.0.6 (affected, NuGet); 4.0.8 (affected, NuGet); 4.0.9 (affected, NuGet); 4.1.0 (affected, NuGet); 4.1.1 (affected, NuGet); 4.1.10 (affected, NuGet); 4.1.2 (affected, NuGet); 4.1.3 (affected, NuGet); 4.1.4 (affected, NuGet); 4.1.5 (affected, NuGet); 4.1.6 (affected, NuGet); 4.1.7 (affected, NuGet); 4.1.8 (affected, NuGet); 4.1.9 (affected, NuGet); 4.2.0 (affected, NuGet); 4.2.1 (affected, NuGet); 4.2.2 (affected, NuGet); 4.2.3 (affected, NuGet); 4.2.4 (affected, NuGet); 4.2.5 (affected, NuGet); 4.2.6 (affected, NuGet); 4.2.7 (affected, NuGet); 4.2.8 (affected, NuGet); 4.3.0 (affected, NuGet); 4.3.1 (affected, NuGet); 4.3.10 (affected, NuGet); 4.3.11 (affected, NuGet); 4.3.12 (affected, NuGet); 4.3.13 (affected, NuGet); 4.3.2 (affected, NuGet); 4.3.3 (affected, NuGet); 4.3.4 (affected, NuGet); 4.3.6 (affected, NuGet); 4.3.7 (affected, NuGet); 4.3.8 (affected, NuGet); 4.3.9 (affected, NuGet); 4.4.0 (affected, NuGet); 4.4.1 (affected, NuGet); 4.4.2 (affected, NuGet); 4.4.3 (affected, NuGet); 4.5.0 (affected, NuGet); 4.5.1 (affected, NuGet); 4.5.2 (affected, NuGet); 4.5.3 (affected, NuGet); 4.5.4 (affected, NuGet); 4.5.5 (affected, NuGet); 4.5.6 (affected, NuGet); 4.5.7 (affected, NuGet); 4.5.8 (affected, NuGet); 4.6.0 (affected, NuGet); 4.6.1 (affected, NuGet); 4.6.2 (affected, NuGet); 4.6.3 (affected, NuGet); 4.6.4 (affected, NuGet); 4.6.5 (affected, NuGet); 4.6.6 (affected, NuGet); 4.6.7 (affected, NuGet); 4.7.0 (affected, NuGet); 4.7.10 (affected, NuGet); 4.7.11 (affected, NuGet); 4.7.12 (affected, NuGet); 4.7.13 (affected, NuGet); 4.7.3 (affected, NuGet); 4.7.4 (affected, NuGet); 4.7.5 (affected, NuGet); 4.7.6 (affected, NuGet); 4.7.7 (affected, NuGet); 4.7.8 (affected, NuGet); 4.7.9 (affected, NuGet); 4.8.0 (affected, NuGet); 4.8.1 (affected, NuGet); 4.8.2 (affected, NuGet); 4.8.3 (affected, NuGet); 4.8.4 (affected, NuGet); 4.8.5 (affected, NuGet); 4.9.0 (affected, NuGet); 4.9.1 (affected, NuGet); 4.9.10 (affected, NuGet); 4.9.11 (affected, NuGet); 4.9.2 (affected, NuGet); 4.9.3 (affected, NuGet); 4.9.4 (affected, NuGet); 4.9.5 (affected, NuGet); 4.9.6 (affected, NuGet); 4.9.7 (affected, NuGet); 4.9.8 (affected, NuGet); 4.9.9 (affected, NuGet); 5.0.0 (affected, NuGet); 5.0.1 (affected, NuGet); 5.0.10 (affected, NuGet); 5.0.11 (affected, NuGet); 5.0.12 (affected, NuGet); 5.0.13 (affected, NuGet); 5.0.14 (affected, NuGet); 5.0.15 (affected, NuGet); 5.0.16 (affected, NuGet); 5.0.2 (affected, NuGet); 5.0.3 (affected, NuGet); 5.0.4 (affected, NuGet); 5.0.5 (affected, NuGet); 5.0.6 (affected, NuGet); 5.0.7 (affected, NuGet); 5.0.8 (affected, NuGet); 5.0.9 (affected, NuGet); 5.1.0 (affected, NuGet); 5.1.1 (affected, NuGet); 5.1.2 (affected, NuGet); 5.1.3 (affected, NuGet); 5.1.4 (affected, NuGet); 5.1.5 (affected, NuGet); 5.1.6 (affected, NuGet); 5.2.0 (affected, NuGet); 5.2.1 (affected, NuGet); 5.2.2 (affected, NuGet); 5.3.0 (affected, NuGet); 5.3.1 (affected, NuGet); 5.3.2 (affected, NuGet); 5.4.0 (affected, NuGet); 5.4.1 (affected, NuGet); 5.4.2 (affected, NuGet); 5.5.0 (affected, NuGet); 5.5.1 (affected, NuGet); Ecosystem version events: introduced 0; fixed 5.6.0. Source: OSV GHSA-w7jx-j77m-wp65
-  / tinymce/tinymce (tinymce/tinymce): 4.0.0 (affected, Packagist); 4.0.1 (affected, Packagist); 4.0.10 (affected, Packagist); 4.0.11 (affected, Packagist); 4.0.12 (affected, Packagist); 4.0.13 (affected, Packagist); 4.0.14 (affected, Packagist); 4.0.15 (affected, Packagist); 4.0.16 (affected, Packagist); 4.0.17 (affected, Packagist); 4.0.18 (affected, Packagist); 4.0.19 (affected, Packagist); 4.0.2 (affected, Packagist); 4.0.20 (affected, Packagist); 4.0.21 (affected, Packagist); 4.0.22 (affected, Packagist); 4.0.23 (affected, Packagist); 4.0.24 (affected, Packagist); 4.0.25 (affected, Packagist); 4.0.26 (affected, Packagist); 4.0.27 (affected, Packagist); 4.0.28 (affected, Packagist); 4.0.3 (affected, Packagist); 4.0.4 (affected, Packagist); 4.0.5 (affected, Packagist); 4.0.6 (affected, Packagist); 4.0.7 (affected, Packagist); 4.0.8 (affected, Packagist); 4.0.9 (affected, Packagist); 4.1.0 (affected, Packagist); 4.1.1 (affected, Packagist); 4.1.10 (affected, Packagist); 4.1.2 (affected, Packagist); 4.1.3 (affected, Packagist); 4.1.4 (affected, Packagist); 4.1.5 (affected, Packagist); 4.1.6 (affected, Packagist); 4.1.7 (affected, Packagist); 4.1.8 (affected, Packagist); 4.1.9 (affected, Packagist); 4.2.0 (affected, Packagist); 4.2.1 (affected, Packagist); 4.2.2 (affected, Packagist); 4.2.3 (affected, Packagist); 4.2.4 (affected, Packagist); 4.2.5 (affected, Packagist); 4.2.6 (affected, Packagist); 4.2.7 (affected, Packagist); 4.2.8 (affected, Packagist); 4.3.0 (affected, Packagist); 4.3.1 (affected, Packagist); 4.3.10 (affected, Packagist); 4.3.11 (affected, Packagist); 4.3.12 (affected, Packagist); 4.3.13 (affected, Packagist); 4.3.2 (affected, Packagist); 4.3.3 (affected, Packagist); 4.3.4 (affected, Packagist); 4.3.6 (affected, Packagist); 4.3.7 (affected, Packagist); 4.3.8 (affected, Packagist); 4.3.9 (affected, Packagist); 4.4.0 (affected, Packagist); 4.4.1 (affected, Packagist); 4.4.2 (affected, Packagist); 4.4.3 (affected, Packagist); 4.5.0 (affected, Packagist); 4.5.1 (affected, Packagist); 4.5.12 (affected, Packagist); 4.5.2 (affected, Packagist); 4.5.3 (affected, Packagist); 4.5.4 (affected, Packagist); 4.5.5 (affected, Packagist); 4.5.6 (affected, Packagist); 4.5.7 (affected, Packagist); 4.5.8 (affected, Packagist); 4.5.9 (affected, Packagist); 4.6.0 (affected, Packagist); 4.6.1 (affected, Packagist); 4.6.2 (affected, Packagist); 4.6.3 (affected, Packagist); 4.6.4 (affected, Packagist); 4.6.5 (affected, Packagist); 4.6.6 (affected, Packagist); 4.6.7 (affected, Packagist); 4.7.0 (affected, Packagist); 4.7.1 (affected, Packagist); 4.7.10 (affected, Packagist); 4.7.11 (affected, Packagist); 4.7.12 (affected, Packagist); 4.7.13 (affected, Packagist); 4.7.2 (affected, Packagist); 4.7.3 (affected, Packagist); 4.7.4 (affected, Packagist); 4.7.5 (affected, Packagist); 4.7.6 (affected, Packagist); 4.7.7 (affected, Packagist); 4.7.8 (affected, Packagist); 4.7.9 (affected, Packagist); 4.8.0 (affected, Packagist); 4.8.1 (affected, Packagist); 4.8.2 (affected, Packagist); 4.8.3 (affected, Packagist); 4.8.4 (affected, Packagist); 4.8.5 (affected, Packagist); 4.9.0 (affected, Packagist); 4.9.1 (affected, Packagist); 4.9.10 (affected, Packagist); 4.9.11 (affected, Packagist); 4.9.2 (affected, Packagist); 4.9.3 (affected, Packagist); 4.9.4 (affected, Packagist); 4.9.5 (affected, Packagist); 4.9.6 (affected, Packagist); 4.9.7 (affected, Packagist); 4.9.8 (affected, Packagist); 4.9.9 (affected, Packagist); 5.0.0 (affected, Packagist); 5.0.1 (affected, Packagist); 5.0.10 (affected, Packagist); 5.0.11 (affected, Packagist); 5.0.12 (affected, Packagist); 5.0.13 (affected, Packagist); 5.0.14 (affected, Packagist); 5.0.15 (affected, Packagist); 5.0.16 (affected, Packagist); 5.0.2 (affected, Packagist); 5.0.3 (affected, Packagist); 5.0.4 (affected, Packagist); 5.0.5 (affected, Packagist); 5.0.6 (affected, Packagist); 5.0.7 (affected, Packagist); 5.0.8 (affected, Packagist); 5.0.9 (affected, Packagist); 5.1.0 (affected, Packagist); 5.1.1 (affected, Packagist); 5.1.2 (affected, Packagist); 5.1.3 (affected, Packagist); 5.1.4 (affected, Packagist); 5.1.5 (affected, Packagist); 5.1.6 (affected, Packagist); 5.2.0 (affected, Packagist); 5.2.1 (affected, Packagist); 5.2.2 (affected, Packagist); 5.3.0 (affected, Packagist); 5.3.1 (affected, Packagist); 5.3.2 (affected, Packagist); 5.4.0 (affected, Packagist); 5.4.1 (affected, Packagist); 5.4.2 (affected, Packagist); 5.5.0 (affected, Packagist); 5.5.1 (affected, Packagist); Ecosystem version events: introduced 0; fixed 5.6.0. Source: OSV GHSA-w7jx-j77m-wp65

## Severity and prioritization

- CVSS 3.1: 6.1 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 1.17% as of 2026-11-08; percentile 67.51%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/tinymce/tinymce/security/advisories/GHSA-w7jx-j77m-wp65 (CNA: VulnCheck; vendor-advisory)

- https://www.npmjs.com/package/tinymce (CNA: VulnCheck; related)

- https://www.tiny.cloud/docs/release-notes/release-notes56/#securityfixes (CNA: VulnCheck; related)

- https://github.com/advisories/GHSA-w7jx-j77m-wp65 (CNA: VulnCheck; vendor-advisory)

- https://vulncheck.com/advisories/vc-advisory-GHSA-w7jx-j77m-wp65 (CNA: VulnCheck; third-party-advisory)

- https://github.com/tinymce/tinymce/security/advisories/GHSA-w7jx-j77m-wp65 (ADP: CVE; vendor-advisory, x_transferred)

- https://www.npmjs.com/package/tinymce (ADP: CVE; related, x_transferred)

- https://www.tiny.cloud/docs/release-notes/release-notes56/#securityfixes (ADP: CVE; related, x_transferred)

- https://github.com/advisories/GHSA-w7jx-j77m-wp65 (ADP: CVE; third-party-advisory, x_transferred)

- https://vulncheck.com/advisories/vc-advisory-GHSA-w7jx-j77m-wp65 (ADP: CVE; third-party-advisory, x_transferred)

- https://github.com/advisories/GHSA-w7jx-j77m-wp65 (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-w7jx-j77m-wp65 (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2024-21911; retrieved 2026-11-08; source updated 2026-11-08

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-w7jx-j77m-wp65; retrieved 2026-11-08; source updated 2026-07-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-21911; retrieved 2026-11-08; source updated Not reported

Revision: ebf8de3be6af2feb0b4d12d283d7a953a5c3644aa77a37f1221eaf85050e5b8f

Canonical: https://y2.dev/cve/CVE-2024-21911

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