CVE-2026-13569 Overview
CVE-2026-13569 is a SQL injection vulnerability affecting weng-xianhu EyouCMS through version 1.7.1. The flaw resides in the API component reachable via /index.php, where the click_like argument is not sanitized before use in a database query. An authenticated remote attacker with high privileges can manipulate this parameter to inject arbitrary SQL statements. The vulnerability is categorized under [CWE-74] (Improper Neutralization of Special Elements in Output). Public disclosure of the exploit details has occurred, and the project maintainers were notified through an issue report but have not yet responded.
Critical Impact
Successful exploitation allows an authenticated remote attacker to inject SQL commands through the click_like parameter, potentially exposing database contents and enabling limited data tampering.
Affected Products
- weng-xianhu EyouCMS versions up to and including 1.7.1
- EyouCMS API component (/index.php endpoint)
- Deployments exposing the click_like request parameter
Discovery Timeline
- 2026-06-29 - CVE-2026-13569 published to NVD
- 2026-06-29 - Last updated in NVD database
Technical Details for CVE-2026-13569
Vulnerability Analysis
The vulnerability is a SQL injection flaw in the EyouCMS API. The /index.php endpoint processes the click_like request parameter without applying proper input validation or parameterized query construction. Attacker-controlled data flows into a SQL statement, allowing an attacker to alter the query logic.
Exploitation requires network access to the vulnerable endpoint and high-privilege authentication, as reflected by the PR:H component of the CVSS 4.0 vector. No user interaction is required. The impact on confidentiality, integrity, and availability is limited in scope, and the vulnerability does not propagate to a subsequent system.
Exploit proof-of-concept material has been disclosed publicly through third-party trackers, increasing the likelihood of opportunistic exploitation against internet-exposed instances.
Root Cause
The root cause is improper neutralization of special elements passed via the click_like parameter. The EyouCMS API concatenates the parameter value into a SQL query rather than binding it as a parameter. Because the application also fails to enforce type or character allowlisting, characters such as single quotes, comment markers, and boolean operators pass through unchanged.
Attack Vector
An attacker authenticated with a high-privilege account issues an HTTP request to /index.php targeting the API handler that reads the click_like argument. By supplying crafted SQL fragments, the attacker changes the semantics of the underlying query. Depending on the query context, this can be used to read additional rows, extract data through boolean or time-based inference, or modify limited fields.
The vulnerability manifests in the API request handling logic for click_like. Refer to the VulDB CVE Report and the GitHub Issue Tracker for further technical context.
Detection Methods for CVE-2026-13569
Indicators of Compromise
- HTTP requests to /index.php containing SQL metacharacters (', --, /*, UNION, SLEEP) within the click_like parameter.
- Unexpected database errors or long response times correlated with requests referencing click_like.
- Access log entries showing repeated click_like requests from a single source within a short window.
Detection Strategies
- Deploy web application firewall (WAF) signatures that inspect the click_like parameter for SQL injection patterns.
- Enable database query logging on the EyouCMS backend and alert on syntactically malformed queries originating from the API handler.
- Correlate authentication logs with API activity to identify high-privilege accounts issuing atypical query patterns.
Monitoring Recommendations
- Monitor outbound traffic from the EyouCMS host for unexpected data volumes that could indicate exfiltration through blind SQL injection.
- Track failed and successful admin logins alongside /index.php API calls to spot credential abuse.
- Retain HTTP access logs and database audit logs for at least 90 days to support incident investigation.
How to Mitigate CVE-2026-13569
Immediate Actions Required
- Restrict network exposure of the EyouCMS administrative and API endpoints to trusted networks or VPN users.
- Rotate credentials for high-privilege EyouCMS accounts and audit for unauthorized privilege grants.
- Deploy WAF rules that block SQL metacharacters and known injection payloads in the click_like parameter.
Patch Information
As of the NVD publication date, the EyouCMS project has not released a patch and has not responded to the reporter. Track the GitHub Project Repository and the GitHub Issue Tracker for updates. Until a fix is released, apply compensating controls rather than relying on version upgrades.
Workarounds
- Place EyouCMS behind a reverse proxy that enforces strict allowlisting on the click_like parameter (numeric-only if applicable).
- Apply least-privilege configuration to the database account used by EyouCMS so injection cannot alter schema or read unrelated tables.
- Disable or firewall the affected API route if the click_like functionality is not required by the deployment.
# Example WAF rule (ModSecurity) to block SQL metacharacters in click_like
SecRule ARGS:click_like "@rx (?i)(\bunion\b|\bselect\b|--|/\*|\bsleep\s*\(|\bor\b\s+1=1)" \
"id:1026135690,phase:2,deny,status:403,log,msg:'CVE-2026-13569 EyouCMS click_like SQLi attempt'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
