Settings modification via unverified compute_post requests
Published Apr 22, 2026 · Updated Apr 22, 2026
Cross-site request forgery in chsxf mCatFilter 0.5.2 and earlier allows remote attackers to modify plugin settings via forged POST data. The compute_post() function runs from the plugin constructor on every page load and passes unverified $_POST values to update_option() without a nonce or capability check. Exploitation requires an administrator to submit the attacker's request, after which category exclusions, feed flags, and tag-page exclusions can be changed.
Summary
What happened
Cross-site request forgery in chsxf mCatFilter 0.5.2 and earlier allows remote attackers to modify plugin settings via forged POST data. The compute_post() function runs from the plugin constructor on every page load and passes unverified $_POST values to update_option() without a nonce or capability check. Exploitation requires an administrator to submit the attacker's request, after which category exclusions, feed flags, and tag-page exclusions can be changed.
The record
- CVE
- CVE-2026-4139
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Vendor
- chsxf
- Product
- mCatFilter
- Classifications
- T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 22, 2026CVE publishedPublication date reported by the CVE source.
- Apr 22, 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?
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- Affected versionversion=0 <=0.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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Your stack
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