Browser script execution via unsafe text truncation
Published Jul 9, 2024 · Updated Mar 14, 2025
Cross-site scripting in Joomla! CMS 3.0.0 through 3.10.15, 4.0.0 through 4.4.5, and 5.0.0 through 5.1.1 allows remote attackers to run script. StringHelper::truncate improperly handles untrusted input when shortening text, leaving an XSS vector in its output; Joomla has not published the faulty transformation. Exploitation requires a Joomla rendering path to pass attacker-controlled text to this helper and a user to view the resulting page, allowing script execution in that user's browser context.
Summary
What happened
Cross-site scripting in Joomla! CMS 3.0.0 through 3.10.15, 4.0.0 through 4.4.5, and 5.0.0 through 5.1.1 allows remote attackers to run script. StringHelper::truncate improperly handles untrusted input when shortening text, leaving an XSS vector in its output; Joomla has not published the faulty transformation. Exploitation requires a Joomla rendering path to pass attacker-controlled text to this helper and a user to view the resulting page, allowing script execution in that user's browser context.
The record
- CVE
- CVE-2024-21731
- Published
- Jul 9, 2024
- Updated
- Mar 14, 2025
- Vendor
- Joomla! Project
- Product
- Joomla! CMS
- Classifications
- CWE-79, CAPEC-18
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 9, 2024CVE publishedPublication date reported by the CVE source.
- Mar 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.0.0-3.10.15
- Affected versionversion=4.0.0-4.4.5
- Affected versionversion=5.0.0-5.1.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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