Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5h9g-x5rv-25wg. This link is maintained to preserve external references.
Original Description TinyMCE versions before 5.9.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browser.
Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5h9g-x5rv-25wg. This link is maintained to preserve external references.
Original Description TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. An unauthenticated and remote attacker could insert crafted HTML into the editor resulting in arbitrary JavaScript execution in another user's browser.
Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5h9g-x5rv-25wg. This link is maintained to preserve external references.
Original Description TinyMCE versions before 5.10.0 are affected by a cross-site scripting vulnerability. A remote and unauthenticated attacker could introduce crafted image or link URLs that would result in the execution of arbitrary JavaScript in an editing user's browser.
Impact Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via crafted data-mce- attributes, which are executed when content is rendered. Impacts users of TinyMCE with the media plugin enabled.
Patches This vulnerability has been patched in TinyMCE 8.5.1, TinyMCE 7.9.3 and TinyMCE 5.11.1 LTS by ensuring that, when using the media plugin, any content with data-mce-object and data-mce-p- attributes are properly sanitized.
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 Aymane MAZGUITI and Ange Primiterra for their help identifying this vulnerability.
Impact TinyMCE 6.8.x contains an XSS vulnerability caused by improper SVG namespace scope handling in the sanitizer. A crafted payload using nested <svg> elements can bypass attribute sanitization and execute arbitrary JavaScript.
Patches This issue affects TinyMCE 6.8.x-7.0.x. The vulnerability is fixed in TinyMCE 7.1.0 and later.
Workarounds No official workaround available.
Acknowledgements Tiny thanks maple3142 (<https://maple3142.net>) of DEVCORE for their help identifying this vulnerability.
References Fix introduced in TinyMCE 7.1.0 though a rewrite of code causing the vulnerability.
Impact Stored XSS vulnerability via unsanitized data-mce- attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation.
Patches Patched by stripping unsafe data-mce- attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x).
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 Tadi Kadango (website) and Ivan Babenko for their help identifying this vulnerability.
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.
tinymce 4.7.11, 4.7.12 is affected by: CWE-79: Improper Neutralization of Input During Web Page Generation. The impact is: JavaScript code execution. The component is: Media element. The attack vector is: The victim must paste malicious content to media element's embed tab.
TinyMCE before 4.9.7 and 5.x before 5.1.4 allows XSS in the core parser, the paste plugin, and the visualchars plugin by using the clipboard or APIs to insert content into the editor.
A cross-site scripting (XSS) vulnerability in TinyMCE 5.2.1 and earlier allows remote attackers to inject arbitrary web script when configured in classic editing mode.