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GHSA-vrv8-v4w8-f95h

MediumCVSS 6.1 / 10
Published Aug 11, 2020·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

Impact

A cross-site scripting (XSS) vulnerability was discovered in the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.10 or lower and TinyMCE 5.4.0 or lower.

Patches

This vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic.

Workarounds

The workarounds available are:

  • upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1 or
  • enable the media plugin, which overrides the default parsing behaviour for iframes or
  • add the following workaround to update the parsing schema rules for iframes:

Example: Change the default schema for iframes

setup: function(editor) {
  editor.on('PreInit', function() {
    editor.schema.getSpecialElements()['iframe'] = /</iframe[^>]*>/gi;
  });
}

Acknowledgements

Tiny Technologies would like to thank George Steketee and Chris Davis at Bishop Fox for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
6.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
5.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
1.81%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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