Tinymce
CVE-2024-21908
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.36%. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAIv1 – Mar 28, 2026
TinyMCE versions before 5.9.0 are affected by a stored cross-site scripting vulnerability. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in composer, npm, nuget
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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. Affected products include: Tiny Tinymce. Version information: before 5.9.0.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionNVD
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.
Executive ViewAI
CVE-2024-21908 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
Stored cross-site scripting in the TinyMCE rich text editor's media plugin lets a low-privileged authenticated content a
TinyMCE versions before 5.6.0 are affected by a stored cross-site scripting vulnerability. Rated medium severity (CVSS 6
TinyMCE versions before 5.10.0 are affected by a cross-site scripting vulnerability. Rated medium severity (CVSS 6.1), t
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
tinymce 4.7.11, 4.7.12 is affected by: CWE-79: Improper Neutralization of Input During Web Page Generation. Rated medium
Cross-site scripting (XSS) vulnerability in swfupload.swf in SWFUpload 2.2.0.1 and earlier, as used in WordPress before
moxieplayer.as in Moxiecode moxieplayer, as used in the TinyMCE Media plugin in WordPress before 3.5.2 and other product
The bbcode plugin in TinyMCE 3.5.8 does not properly enforce the TinyMCE security policy for the (1) encoding directive
Cross-site request forgery (CSRF) vulnerability in the TinyMCE Color Picker plugin before 1.2 for WordPress allows remot
TinyMCE is an open source rich text editor. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable
TinyMCE is an open source rich text editor. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable
TinyMCE is an open source rich text editor. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable
Exploit-DB