CVE-2026-55173Public exploitNetwork attack vector

Remote command execution via unfiltered shell ampersand

Published Jul 16, 2026 · Updated Jul 16, 2026

OS command injection in WWBN AVideo 29.0 and earlier allows remote attackers to execute commands on standalone encoder servers. The sanitizeFFmpegCommand function in plugin/API/standAlone/functions.php leaves a single ampersand intact before execAsync embeds the result in an sh -c command, where the ampersand separates injected commands. Exploitation requires a crafted valid encrypted codeToExecEncrypted payload; successful commands run with the standalone encoder service's privileges.

CVSS severity8.1
High
EPSS probability3.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in WWBN AVideo 29.0 and earlier allows remote attackers to execute commands on standalone encoder servers. The sanitizeFFmpegCommand function in plugin/API/standAlone/functions.php leaves a single ampersand intact before execAsync embeds the result in an sh -c command, where the ampersand separates injected commands. Exploitation requires a crafted valid encrypted codeToExecEncrypted payload; successful commands run with the standalone encoder service's privileges.

The record

CVE
CVE-2026-55173
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
WWBN
Product
AVideo
Classifications
CWE-78, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 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.

  1. Affected versionversion=<= 29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WWBN · AVideoversion=<= 29.0

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell
T1190Exploit Public-Facing Application

Public exploit references

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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