Stored XSS via unescaped delay post meta
Published Aug 6, 2026 · Updated Aug 6, 2026
Stored XSS in MetaSlider Slideshow 3.111.0 and earlier allows remote authenticated users to inject scripts through the delay post meta setting. The ml-slider post type lacks custom capability restrictions, while XML-RPC custom_fields writes an unsanitized delay value to unprotected ml-slider_settings meta that is rendered without escaping. Author-level access is sufficient, and the stored script runs when any user opens the affected slider page, enabling actions in that user's web session.
Summary
What happened
Stored XSS in MetaSlider Slideshow 3.111.0 and earlier allows remote authenticated users to inject scripts through the delay post meta setting. The ml-slider post type lacks custom capability restrictions, while XML-RPC custom_fields writes an unsanitized delay value to unprotected ml-slider_settings meta that is rendered without escaping. Author-level access is sufficient, and the stored script runs when any user opens the affected slider page, enabling actions in that user's web session.
The record
- CVE
- CVE-2026-18400
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- MetaSlider
- Product
- MetaSlider Slideshow
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 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=0 <=3.111.0
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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