Unauthenticated file write via caller-controlled path
Published Sep 5, 2026 · Updated Sep 5, 2026
Path traversal in WWBN AVideo 29.0 and earlier allows remote attackers to write files beneath the application root. The notify.ffmpeg.json.php endpoint concatenates the untrusted avideoRelativePath value onto systemRootPath, while its notifyCode check accepts any ciphertext that decrypts to a nonempty value. Exploitation requires the non-default standAloneFFMPEG setting and previously issued ciphertext; successful requests plant or overwrite content served by that encoder host.
Summary
What happened
Path traversal in WWBN AVideo 29.0 and earlier allows remote attackers to write files beneath the application root. The notify.ffmpeg.json.php endpoint concatenates the untrusted avideoRelativePath value onto systemRootPath, while its notifyCode check accepts any ciphertext that decrypts to a nonempty value. Exploitation requires the non-default standAloneFFMPEG setting and previously issued ciphertext; successful requests plant or overwrite content served by that encoder host.
The record
- CVE
- CVE-2026-86189
- Published
- Sep 5, 2026
- Updated
- Sep 5, 2026
- Vendor
- WWBN
- Product
- AVideo
- Classifications
- CWE-73, CWE-434, CWE-22, CWE-306, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 5, 2026CVE publishedPublication date reported by the CVE source.
- Sep 5, 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 <=29.0
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-cprx-fggj-7vpq 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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