CVE-2025-66203Public exploitNetwork attack vector

Authenticated command execution via injected yt-dlp arguments

Published Dec 26, 2025 · Updated Dec 26, 2025

OS command injection in lemon8866 StreamVault before 251126 allows remote authenticated users to execute commands through yt-dlp arguments. The /admin/api/saveConfig endpoint stores unvalidated ytdlpargs globally, and YtDlpUtil.exec inserts them into the yt-dlp command line. Administrative access or access to the admin API plus an application token is required; a later video-processing request runs the injected command with the application process's privileges.

CVSS severity9.1
Critical
EPSS probability0.76%
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 lemon8866 StreamVault before 251126 allows remote authenticated users to execute commands through yt-dlp arguments. The /admin/api/saveConfig endpoint stores unvalidated ytdlpargs globally, and YtDlpUtil.exec inserts them into the yt-dlp command line. Administrative access or access to the admin API plus an application token is required; a later video-processing request runs the injected command with the application process's privileges.

The record

CVE
CVE-2025-66203
Published
Dec 26, 2025
Updated
Dec 26, 2025
Vendor
lemon8866
Product
StreamVault
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 26, 2025Record 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=< 251126

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

lemon8866 · StreamVaultversion=< 251126

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

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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