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GHSA-v98h-vmpc-fpqvhigh8.7

TinyMCE Cross-Site Scripting (XSS) vulnerability through `mce:protected` comments

Impact

Stored XSS vulnerability via forged mce:protected comments. Allows attackers to bypass sanitization and inject scripts that execute when content is restored. Impacts users who utilize the protect option.

Source excerpt · OSV

What to do

Upgrade to TinyMCE 7.9.3 or higher.

OSV guidance

Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial long-term support contract).

OSV guidance

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

tinymce npm
Affected rangeRecorded fix
Earlier releases through 5.10.9 (inclusive)Semantic versionsNot recorded
From 6.0.0 before 7.9.3Semantic versions7.9.3
From 8.0.0 before 8.5.1Semantic versions8.5.1

Version evidence: OSV · GHSA-v98h-vmpc-fpqv

View original version evidence (0 explicit versions)
TinyMCE NuGet
Affected rangeRecorded fix
Earlier releases through 5.10.9 (inclusive)Ecosystem versionsNot recorded
From 6.0.0 before 7.9.3Ecosystem versions7.9.3
From 8.0.0 before 8.5.1Ecosystem versions8.5.1

Version evidence: OSV · GHSA-v98h-vmpc-fpqv

View original version evidence (245 explicit versions)
tinymce/tinymce Packagist
Affected rangeRecorded fix
Earlier releases through 5.10.9 (inclusive)Ecosystem versionsNot recorded
From 6.0.0 before 7.9.3Ecosystem versions7.9.3
From 8.0.0 before 8.5.1Ecosystem versions8.5.1

Version evidence: OSV · GHSA-v98h-vmpc-fpqv

View original version evidence (238 explicit versions)

Original source description

Impact

Stored XSS vulnerability via forged mce:protected comments. Allows attackers to bypass sanitization and inject scripts that execute when content is restored. Impacts users who utilize the protect option.

Patches

Patched by validating decoded mce:protected content against configured protect regex rules before restoring. Users should upgrade to the latest patched version.

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 Ivan Babenko for their help identifying this vulnerability.

References