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CVE-2026-116675

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

8.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.35%Unchanged since Oct 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

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

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.

Record
CVE-2026-116675
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-111106 8.5

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.

Record
EUVD-2026-111106
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-mf2p-h6hf-fcwm 8.5

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

Impact

Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via elements crafted through the data-mce-object attribute, which are created and executed before sanitization. Impacts users of TinyMCE with the media plugin enabled.

Patches

This vulnerability has been patched in TinyMCE 8.9.3 and TinyMCE 7.9.4 by ensuring that, when using the media plugin, any content created through the data-mce-object attribute is properly sanitized first.

Workarounds

No official workaround available.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 8.9.3 or higher. Upgrade to TinyMCE 7.9.4 or higher.

Acknowledgements

Tiny thanks Fariskhi Vidyan and David Vieira Kurz (HiSolutions AG) for their help identifying this vulnerability.

Record
GHSA-mf2p-h6hf-fcwm
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
NVD 8.5

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.

Record
CVE-2026-116675
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-79
Updated
2026-11-02
OSV 8.5

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

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.

Record
CVE-2026-116675
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVGHSA-mf2p-h6hf-fcwm 8.5

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

Impact

Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via elements crafted through the data-mce-object attribute, which are created and executed before sanitization. Impacts users of TinyMCE with the media plugin enabled.

Patches

This vulnerability has been patched in TinyMCE 8.9.3 and TinyMCE 7.9.4 by ensuring that, when using the media plugin, any content created through the data-mce-object attribute is properly sanitized first.

Workarounds

No official workaround available.

Fix

To avoid this vulnerability:

Upgrade to TinyMCE 8.9.3 or higher. Upgrade to TinyMCE 7.9.4 or higher.

Acknowledgements

Tiny thanks Fariskhi Vidyan and David Vieira Kurz (HiSolutions AG) for their help identifying this vulnerability.

Record
GHSA-mf2p-h6hf-fcwm
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-79
Updated
2026-11-02
OSVUBUNTU-CVE-2026-116675 8.5

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.

Record
UBUNTU-CVE-2026-116675
CVSS 4.0
8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tinymce
npm
 8.5.1 up to 8.9.3
8.9.3
TinyMCE
NuGet
 8.5.1 up to 8.9.3
8.9.3
tinymce/tinymce
Packagist
 8.5.1 up to 8.9.3
8.9.3
tinymce
npm
 7.9.3 to 7.9.3
7.9.4
TinyMCE
NuGet
 7.9.3 to 7.9.3
7.9.4
tinymce/tinymce
Packagist
 7.9.3 to 7.9.3
7.9.4
TinyMCE
NuGet
 8.5.1 up to 8.9.3, plus listed versions
8.6.08.7.08.8.08.8.18.8.28.9.08.9.18.9.2
8.9.3
tinymce/tinymce
Packagist
 8.5.1 up to 8.9.3, plus listed versions
8.6.08.7.08.8.08.8.18.8.28.9.08.9.18.9.2
8.9.3
tinymce
npm
 7.9.3 up to 7.9.4
7.9.4
TinyMCE
NuGet
 7.9.3 up to 7.9.4
7.9.4
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Affected packages
PackageAffectedFixed
tinymce/tinymce
Packagist
 7.9.3 up to 7.9.4
7.9.4
tinymce
Ubuntu:16.04:LTS
 All versions, plus listed versions
3.4.8+dfsg0-1
 None known
tinymce
Ubuntu:18.04:LTS
 All versions, plus listed versions
3.4.8+dfsg0-2
 None known
tinymce
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.4.8+dfsg0-2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-116675 is a high vulnerability (CVSS 8.5) in Tinymce, published October 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. Fixed in tinymce 8.9.3.

References

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