Strapi up to 4.26.2/5.48.0 Content Manager WYSIWYG Preview cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in Strapi up to 4.26.2/5.48.0. This affects an unknown function of the component Content Manager WYSIWYG Preview Component. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-90561. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Strapi up to 4.26.2/5.48.0. It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component Content Manager WYSIWYG Preview Component. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an Editor or Super Admin's session when the preview pane is expanded, enabling account takeover.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-90561 since 09/12/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 5.48.1 eliminates this vulnerability.

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Productinfo

Name

• Strapi

Version

• 4.26.0
• 4.26.1
• 4.26.2
• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26
• 5.27
• 5.28
• 5.29
• 5.30
• 5.31
• 5.32
• 5.33
• 5.34
• 5.35
• 5.36
• 5.37
• 5.38
• 5.39
• 5.40
• 5.41
• 5.42
• 5.43
• 5.44
• 5.45
• 5.46
• 5.47
• 5.48.0

Website

• Product: https://github.com/strapi/strapi/

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