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PatchSiren cyber security CVE debrief

CVE-2026-63305 WWBN CVE debrief

A critical vulnerability was discovered in AVideo, a video platform, through version 29.0. The vulnerability exists in the ffmpeg.json.php endpoint, where the notifyCode and callback parameters are concatenated into a shell command without proper escaping. This allows attackers who can craft a valid encrypted payload to inject arbitrary shell metacharacters into these fields, enabling the execution of OS commands as the web-server user.

Vendor
WWBN
Product
AVideo
CVSS
CRITICAL 9.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-16
Original CVE updated
2026-07-20
Advisory published
2026-07-16
Advisory updated
2026-07-20

Who should care

Administrators and users of AVideo, especially those using version 29.0 or earlier, should be aware of this critical vulnerability. The vulnerability's high CVSS score of 9.2 indicates its severity, and immediate action is recommended to mitigate potential risks.

Technical summary

The vulnerability is caused by the insecure handling of user input in the ffmpeg.json.php endpoint. Specifically, the notifyCode and callback parameters are concatenated into a shell command without proper escaping, allowing for OS command injection. Attackers can exploit this by crafting a valid encrypted payload with malicious shell metacharacters, leading to arbitrary OS command execution as the web-server user.

Defensive priority

High

Recommended defensive actions

  • Update AVideo to a version beyond 29.0, if available, or apply vendor-recommended patches.
  • Implement input validation and output encoding for user-supplied data in the ffmpeg.json.php endpoint.
  • Monitor the system for suspicious activity, such as unexpected OS commands or shell processes.
  • Consider using a web application firewall (WAF) to detect and prevent common web attacks.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record was published on 2026-07-16T13:16:33.460Z and last modified on 2026-07-16T13:45:55.687Z. The NVD entry is currently Deferred. Limited information is available about the vendor's remediation efforts or affected scope.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63305 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63305

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-63305 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63305

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.