CVE-2026-116675— TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization

Quick assessment

Affected

tinymce tinymce

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TinyMCE 是一款开源富文本编辑器。在 7.9.3 至 7.9.4 版本，以及 8.5.1 至 8.9.3 版本中，媒体插件会在执行内容净化（sanitization）之前，在活动文档中创建通过属性构造的恶意元素。这些元素在处理过程中可执行恶意脚本，从而导致启用了媒体插件的用户面临存储型跨站脚本（Stored XSS）攻击风险。该问题已在 8.9.3 和 7.9.4 版本中得到修复。

CVSS 8.5 · High Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1203 · Exploitation for Client Execution T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization

Source: CVE Program / CVE List V5

Vulnerability Description

TinyMCE is an open source rich text editor. From 7.9.3 until 7.9.4 and from 8.5.1 until 8.9.3, the media plugin creates elements crafted through data-mce-object in the active document before sanitization. Those elements can execute malicious scripts during processing, resulting in stored cross-site scripting for users with the media plugin enabled. This issue is fixed in versions 8.9.3 and 7.9.4.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
tinymce	tinymce	>= 8.5.1, < 8.9.3	-

II. Public POCs for CVE-2026-116675

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-116675

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Other References for CVE-2026-116675 (5)

https://github.com/tinymce/tinymce/releases/tag/8.9.3 x_refsource_MISC
https://www.tiny.cloud/docs/tinymce/7/7.9.4-release-notes/#overview x_refsource_MISC
https://www.tiny.cloud/docs/tinymce/latest/8.9.3-release-notes/#overview x_refsource_MISC
https://github.com/tinymce/tinymce/security/advisories/GHSA-mf2p-h6hf-fcwm x_refsource_CONFIRM
https://github.com/tinymce/tinymce/commit/bd1ab5ef024c648c3f9c0b409e54a6c227c7d8a2 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-116675

IV. Related Vulnerabilities

Same product: tinymce

Same vendor: tinymce

Same weakness: CWE-79