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GHSA-5359-pvf2-pw78medium4.3

TinyMCE Cross-Site Scripting (XSS) vulnerability in handling external SVG files through Object or Embed elements

Impact

A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content loading and content inserting code. A SVG image could be loaded though an object or embed element and that image could potentially contain a XSS payload.

Source excerpt · OSV

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/tinymce Packagist
Affected rangeRecorded fix
Earlier releases before 7.0.0Ecosystem versions7.0.0

Version evidence: OSV · GHSA-5359-pvf2-pw78

View original version evidence (203 explicit versions)
tinymce npm
Affected rangeRecorded fix
Earlier releases before 7.0.0Semantic versions7.0.0

Version evidence: OSV · GHSA-5359-pvf2-pw78

View original version evidence (0 explicit versions)
TinyMCE NuGet
Affected rangeRecorded fix
Earlier releases before 7.0.0Ecosystem versions7.0.0

Version evidence: OSV · GHSA-5359-pvf2-pw78

View original version evidence (210 explicit versions)

Original source description

Impact

A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content loading and content inserting code. A SVG image could be loaded though an object or embed element and that image could potentially contain a XSS payload.

Fix

TinyMCE 6.8.1 introduced a new convert_unsafe_embeds option to automatically convert object and embed elements respective of their type attribute. From TinyMCE 7.0.0 onwards, the convert_unsafe_embeds option is enabled by default.

Workarounds

If you are using TinyMCE 6.8.1 or higher, set convert_unsafe_embeds to true. For any earlier versions, a custom NodeFilter is recommended to remove or modify any object or embed elements. This can be added using the editor.parser.addNodeFilter and editor.serializer.addNodeFilter APIs.

Acknowledgements

Tiny Technologies would like to thank Toni Huttunen of Fraktal Oy for discovering this vulnerability.

References

References