CVE-2026-103766: ClipBucket SQLI Vulnerability

CVE-2026-103766 Overview

CVE-2026-103766 is a SQL injection vulnerability in ClipBucket v5 through version 5.5.3-#197. The flaw resides in admin_area/ads_manager.php and affects the AdsManager::DeleteAd function in includes/classes/ads.class.php. Authenticated users with ad_manager_access permission can inject SQL through the delete parameter. Attackers supply time-based blind payloads concatenated into the delete query to extract user credentials and emails or modify and delete arbitrary records. The vulnerability is classified as [CWE-89] Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Authenticated attackers with ad manager permissions can exfiltrate credentials, modify database records, and delete arbitrary data via time-based blind SQL injection.

Affected Products

ClipBucket v5 (open-source video sharing CMS)
Versions through 5.5.3-#197
Component: admin_area/ads_manager.php and AdsManager::DeleteAd in ads.class.php

Discovery Timeline

2026-10-02 - CVE-2026-103766 published to NVD
2026-10-02 - Last updated in NVD database

Technical Details for CVE-2026-103766

Vulnerability Analysis

The vulnerability stems from unsanitized input flowing from the delete HTTP parameter into a SQL query inside the AdsManager::DeleteAd method. The admin interface at admin_area/ads_manager.php accepts the parameter and passes it directly into string-concatenated SQL. No parameterization or input validation isolates attacker-controlled data from the query structure.

Exploitation requires an authenticated session with the ad_manager_access permission. Once authenticated, the attacker submits crafted payloads to the delete parameter. Because the database does not return visible errors or data in the response, attackers use time-based blind techniques such as SLEEP() or conditional time delays to infer data one bit at a time.

Successful exploitation enables extraction of sensitive data stored in the ClipBucket database, including user credentials and email addresses. Attackers can also issue UPDATE or DELETE statements to modify or destroy arbitrary records.

Root Cause

The root cause is direct string concatenation of the delete parameter into a SQL statement inside AdsManager::DeleteAd. The code path lacks prepared statements, parameter binding, or type casting that would prevent query structure manipulation. See the vulnerable code snippet for details.

Attack Vector

The attack vector is network-based against the admin interface. The attacker must hold valid credentials for an account granted the ad_manager_access permission. Technical analysis is documented in the HackMD write-up and the VulnCheck advisory.

No verified public exploit code is included here. The vulnerability mechanism involves injecting a time-based blind payload into the delete parameter supplied to admin_area/ads_manager.php, which is then concatenated into the DELETE query executed by AdsManager::DeleteAd.

Detection Methods for CVE-2026-103766

Indicators of Compromise

Web server access logs showing requests to admin_area/ads_manager.php with suspicious characters in the delete parameter such as single quotes, SLEEP(, BENCHMARK(, UNION, or -- comments.
Database query logs containing unusually long execution times for DELETE statements originating from the ads manager module.
Authentication logs showing admin or ad manager sessions originating from unexpected geographic locations or IP ranges.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the delete parameter on ads_manager.php for SQL keywords and time-delay function patterns.
Enable MySQL general query log or slow query log and alert on repeated DELETE statements with embedded conditional logic or sleep functions.
Correlate authenticated admin activity with query anomalies in the Singularity Data Lake using OCSF-normalized web and database telemetry.

Monitoring Recommendations

Monitor outbound traffic from the ClipBucket host for data exfiltration patterns following suspicious admin requests.
Track changes to the users table and any password or email field modifications.
Review which accounts hold the ad_manager_access permission and alert on privilege grants.

How to Mitigate CVE-2026-103766

Immediate Actions Required

Restrict access to /admin_area/ by IP allowlist until a patched build is deployed.
Audit all accounts with ad_manager_access and revoke the permission from any non-essential users.
Rotate administrator and user credentials if logs suggest the endpoint was accessed by untrusted sessions.
Review the upstream pull request #925 and apply the fix to any forked deployments.

Patch Information

The fix is tracked in ClipBucket pull request #925 in the MacWarrior/clipbucket-v5 repository. Upgrade to a build that incorporates this patch, which replaces concatenated SQL in AdsManager::DeleteAd with sanitized or parameterized input handling.

Workarounds

Block requests to admin_area/ads_manager.php at the reverse proxy or WAF when the delete parameter contains non-numeric characters.
Enforce strict type casting in a local hotfix by casting the delete parameter to an integer before use in the query.
Disable the ads manager module if ads functionality is not required for the deployment.

bash

# Example nginx rule to drop non-numeric delete values
location /admin_area/ads_manager.php {
    if ($arg_delete !~ "^[0-9]+$") { return 403; }
}