Cross-Site Scripting (XSS) in tinymce (CVE-2026-47761)
Summary
Cross-site scripting in tinymce (CVE-2026-47761). Confidential information can be exposed externally. Mitigation: upgrade to 8.5.1 or later.
Original description
The description as published by the source.
Impact
Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via crafted data-mce-* attributes, which are executed when content is rendered. Impacts users of TinyMCE with the media plugin enabled.
Patches
This vulnerability has been patched in TinyMCE 8.5.1, TinyMCE 7.9.3 and TinyMCE 5.11.1 LTS by ensuring that, when using the media plugin, any content with data-mce-object and data-mce-p-* attributes are properly sanitized.
Workarounds
No official workaround available.
Fix
To avoid this vulnerability:
- Upgrade to TinyMCE 8.5.1 or higher.
- Upgrade to TinyMCE 7.9.3 or higher.
- Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract).
Acknowledgements
Tiny thanks Aymane MAZGUITI and Ange Primiterra for their help identifying this vulnerability.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-47761 has been found in tinymce.
Confidential information can be exposed externally. CVSS score: 8.7/10.
What to do: upgrade tinymce to 8.5.1 or later.
If unsure, ask your IT team or search "tinymce CVE-2026-47761" on the vendor's site.
CVE-2026-47761 (tinymce) — CWE-79 / CVSS v3 8.7
Attack vector: remote (network-reachable)
Patched: 8.5.1 — apply immediately
Workaround: No official workaround available.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in tinymce.
Check the vendor advisory for the affected versions of tinymce.
Severity: High (CVSS 8.7/10). Confidential information can be exposed externally.
Update to 8.5.1.
Workaround: No official workaround available.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'tinymce' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'tinymce' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
tinymceを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
No official workaround available.パッチが適用されるまでの応急処置として、No official workaround available. を実施。回避策の副作用 (機能低下) を確認した上で。
-
3Apply patch patch
Upgrade tinymce to 8.5.1ステージング環境で 8.5.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-47761 tinymce
References
- advisory nvd.nist.gov
- ATLASSIAN JSWSERVER-26949
- package github.com
- patch security-advisories@github.com
- web security-advisories@github.com
- web security-advisories@github.com
- web github.com