Unauthenticated code execution via CSRF plugin upload
Published Mar 23, 2026 · Updated Mar 23, 2026
CSRF in AVideo 26.0 and earlier allows remote attackers to execute arbitrary code by inducing an authenticated administrator to upload a plugin. The objects/pluginImport.json.php endpoint trusts the administrator session without validating a CSRF token, accepts cross-origin multipart requests with the SameSite=None cookie, and extracts unchecked secondary PHP files from plugin ZIP archives. An administrator must visit an attacker-controlled page while logged in over HTTPS; the resulting webshell runs as the web server user.
Summary
What happened
CSRF in AVideo 26.0 and earlier allows remote attackers to execute arbitrary code by inducing an authenticated administrator to upload a plugin. The objects/pluginImport.json.php endpoint trusts the administrator session without validating a CSRF token, accepts cross-origin multipart requests with the SameSite=None cookie, and extracts unchecked secondary PHP files from plugin ZIP archives. An administrator must visit an attacker-controlled page while logged in over HTTPS; the resulting webshell runs as the web server user.
The record
- CVE
- CVE-2026-33507
- Published
- Mar 23, 2026
- Updated
- Mar 23, 2026
- Vendor
- World Wide Broadcast Network
- Product
- AVideo
- Classifications
- CWE-352, T1505.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 23, 2026CVE publishedPublication date reported by the CVE source.
- Mar 23, 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=<= 26.0
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
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
- GHSA-hv36-p4w4-6vmj cross-site plugin-upload proof of conceptproof of concept · demonstrated
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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