Cross-site scripting via schema.org output escaping
Published Aug 18, 2026 · Updated Aug 19, 2026
Cross-site scripting in Joomla! CMS 5.1.0 through 5.4.7 and 6.0.0 through 6.1.2 allows remote authenticated users to inject script-bearing schema.org output. Joomla discloses only that schema.org markup generation uses improper escaping flags; the published record indicates that untrusted schema values are emitted with incorrect neutralization in generated structured-data output. The CNA record scores the flaw with high privileges required, so reachability depends on access to schema-producing content or settings; public sources do not disclose whether exploitation is limited to rendered pages or also affects administrative views.
Summary
What happened
Cross-site scripting in Joomla! CMS 5.1.0 through 5.4.7 and 6.0.0 through 6.1.2 allows remote authenticated users to inject script-bearing schema.org output. Joomla discloses only that schema.org markup generation uses improper escaping flags; the published record indicates that untrusted schema values are emitted with incorrect neutralization in generated structured-data output. The CNA record scores the flaw with high privileges required, so reachability depends on access to schema-producing content or settings; public sources do not disclose whether exploitation is limited to rendered pages or also affects administrative views.
The record
- CVE
- CVE-2026-73336
- Published
- Aug 18, 2026
- Updated
- Aug 19, 2026
- Vendor
- Joomla! Project
- Product
- Joomla! CMS
- Classifications
- CWE-79, CAPEC-18
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record 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=5.1.0-5.4.6
- Affected versionversion=6.0.0-6.1.2
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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