Subscriber-level stored XSS via unchecked options import
Published Jun 7, 2023 · Updated Apr 8, 2026
Stored XSS in Flothemes Flo Forms 1.0.35 and earlier allows remote authenticated users to inject scripts through an AJAX request. The flo_import_forms_options action accepts imported option values without a capability check or sufficient sanitization, then renders them in the WordPress backend without output escaping. Subscriber-level access is sufficient, and the stored JavaScript executes when another user opens an affected administrative page.
Summary
What happened
Stored XSS in Flothemes Flo Forms 1.0.35 and earlier allows remote authenticated users to inject scripts through an AJAX request. The flo_import_forms_options action accepts imported option values without a capability check or sufficient sanitization, then renders them in the WordPress backend without output escaping. Subscriber-level access is sufficient, and the stored JavaScript executes when another user opens an affected administrative page.
The record
- CVE
- CVE-2021-4367
- Published
- Jun 7, 2023
- Updated
- Apr 8, 2026
- Vendor
- Flothemes
- Product
- Flo Forms
- Classifications
- CWE-79, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 7, 2023CVE publishedPublication date reported by the CVE source.
- Apr 8, 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 <=1.0.35
What conditions does exploitation require?
What is affected?
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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Reported exploitation
- Active exploitation reported by WPScanreported exploitation
Technologies
Your stack
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Your stack
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