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CVE-2024-29203

TinyMCE Cross-Site Scripting (XSS) vulnerability in handling iframes

MEDIUM
6.1
CVSS Score
Published: March 26, 2024 at 01:23 PM UTC
Updated: June 17, 2026 at 07:22 AM UTC
2 products affected across 2 vendorsTinymceTinymce

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

TinyMCE is an open source rich text editor. A cross-site scripting (XSS) vulnerability was discovered in TinyMCE’s content insertion code. This allowed `iframe` elements containing malicious code to execute when inserted into the editor. These `iframe` elements are restricted in their permissions by same-origin browser protections, but could still trigger operations such as downloading of malicious assets. This vulnerability is fixed in 6.8.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tinymce· Tiny
95%
v < 6.8.16.8.2 ≤ v < 7.0.0
Affected range stops below 6.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.0, so it looks safe — our inference, not a vendor statement
Tinymce· Tinymce
60%
v < 6.8.1
Affected range stops below 6.8.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/tinymce/tinymce/commit/bcdea2ad14e3c2cea40743fb48c63bba067ae6d1
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/tinymce/tinymce/security/advisories/GHSA-438c-3975-5x3f
x_refsource_MISCRelease Notes
Source: [email protected]
https://www.tiny.cloud/docs/tinymce/6/6.8.1-release-notes/#new-convert_unsafe_embeds-option-that-controls-whether-object-and-embed-elements-will-be-converted-to-more-restrictive-alternatives-namely-img-for-image-mime-types-video-for-video-mime-types-audio-audio-mime-types-or-iframe-for-other-or-unspecified-mime-types
x_refsource_MISCRelease Notes
Source: [email protected]
https://www.tiny.cloud/docs/tinymce/7/7.0-release-notes/#sandbox_iframes-editor-option-is-now-defaulted-to-true

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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