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GHSA-gg8r-xjwq-4w92

MediumCVSS 5.4 / 10
Published Dec 8, 2022·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

Impact

A cross-site scripting (XSS) vulnerability was discovered in the alert and confirm dialogs when these dialogs were provided with malicious HTML content. This can occur in plugins that use the alert or confirm dialogs, such as in the image plugin, which presents these dialogs when certain errors occur. The vulnerability allowed arbitrary JavaScript execution when an alert presented in the TinyMCE UI for the current user.

Patches

This vulnerability has been patched in TinyMCE 5.10.7 and TinyMCE 6.3.1 by ensuring HTML sanitization was still performed after unwrapping invalid elements.

Fix

To avoid this vulnerability:

  • Upgrade to TinyMCE 5.10.7 or higher for TinyMCE 5.x.
  • Upgrade to TinyMCE 6.3.1 or higher for TinyMCE 6.x.

Workaround

To reduce the impact of this vulnerability:

  • Ensure the the images_upload_handler returns a valid value as per the images_upload_handler documentation.

References

  • https://www.tiny.cloud/docs/release-notes/release-notes5107/#securityfixes
  • https://www.tiny.cloud/docs/tinymce/6/6.3-release-notes/#security-fixes

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
5.4

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. 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
5.0

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

EPSS
0.94%

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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Medium severity
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