WordPress Core <= 6.5.2 Stored XSS via Avatar Block Display Name
CVE-2024-4439 Published on May 3, 2024
WordPress Core is vulnerable to Stored Cross-Site Scripting via user display names in the Avatar block in various versions up to 6.5.2 due to insufficient output escaping on the display name. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. In addition, it also makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that have the comment block present and display the comment author's avatar.
Timeline
Disclosed
Weakness Type
What is a Basic XSS Vulnerability?
The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This may allow such characters to be treated as control characters, which are executed client-side in the context of the user's session. Although this can be classified as an injection problem, the more pertinent issue is the improper conversion of such special characters to respective context-appropriate entities before displaying them to the user.
CVE-2024-4439 has been classified to as a Basic XSS vulnerability or weakness.
Products Associated with CVE-2024-4439
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Affected Versions
WordPress Foundation WordPress:- Version 6.0, <= 6.0.7 is affected.
- Version 6.1, <= 6.1.5 is affected.
- Version 6.2, <= 6.2.4 is affected.
- Version 6.3, <= 6.3.3 is affected.
- Version 6.4, <= 6.4.3 is affected.
- Version 6.5, <= 6.5.1 is affected.
- Version 6.0, <= 6.5.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.