EyouCMS <= 1.7.1 Member Avatar Handler Remote Code Execution Vulnerability (CVE-2026-1107)
Executive & SecOps Summary
SECOPS ASSESSMENTEyouCMS up to version 1.7.1 and 5.0, specifically within the Member Avatar Handler component.
Unauthenticated remote attackers can bypass access controls to upload arbitrary files or trigger file inclusion, leading to complete Remote Code Execution (RCE).
Restrict external access to the vulnerable API endpoint, deploy WAF rules, and monitor for official vendor patches.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
As the vendor has not yet responded with an official patch, administrators must closely monitor the official repository for updates. Once a patch is released, upgrade the installation immediately.
# Navigate to EyouCMS root and pull the latest secure release
cd /var/www/html/eyoucms
git pull origin stable2. Temporary Workaround & Hardening Configuration
Until an official patch is available, block all external access to the vulnerable Diyajax.php script using web server configuration rules.
# Add to your Nginx server block configuration
location ~* /Diyajax\.php {
allow 127.0.0.1;
deny all;
}3. Log Audit & IoC Verification Commands
Use the following commands to scan web server access logs for potential exploitation attempts and inspect upload directories for unauthorized PHP files.
# Scan access logs for suspicious requests targeting Diyajax.php with viewfile parameter
grep -E 'Diyajax\.php.*viewfile' /var/log/nginx/access.log /var/log/httpd/access_log 2>/dev/null
# Search for unauthorized PHP files in the uploads directory
find /var/www/html/eyoucms/uploads/ -type f -name '*.php'Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
A critical vulnerability has been identified in EyouCMS up to version 1.7.1/5.0. The root cause lies within the check_userinfo function of the Diyajax.php file, which handles member avatar processing. The application fails to properly sanitize and validate the user-supplied viewfile parameter, allowing attackers to manipulate file paths and bypass upload restrictions.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated remote attacker can craft a malicious HTTP request targeting the Diyajax.php endpoint. By manipulating the viewfile argument, the attacker can force the application to include or write arbitrary files (such as PHP web shells) into writable directories. Since the exploit code is publicly available, the likelihood of active exploitation against internet-facing EyouCMS instances is extremely high.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical), this vulnerability poses a severe threat to organization infrastructures. Successful exploitation grants the attacker full control over the web server under the privileges of the web daemon (e.g., www-data). This can lead to complete database compromise, defacement, deployment of ransomware, or lateral movement into the internal network.
Official Vendor Advisories & References
A weakness has been identified in EyouCMS up to 1.7.1/5.0. Impacted is the function check_userinfo of the file Diyajax.php of the component Member Avatar Handler. Executing a manipulation of the argument viewfile can lead to unrestricted upload. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Frequently Asked SecOps Questions (CVE-2026-1107)
FAQQ1. How critical is CVE-2026-1107 and is it actively exploited in the wild?
CVE-2026-1107 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 0.5%. Organizations running affected versions should prioritize patching based on network exposure.
Q2. Which vendors and products are affected by CVE-2026-1107?
Primary impacted vendors include eyoucms across eyoucms. Scope summary: EyouCMS versions up to 1.7.1 and 5.0 (specifically Diyajax.php in Member Avatar Handler)
Q3. What temporary mitigations or workarounds exist for CVE-2026-1107 before patching?
[Mitigation] Restrict external access to the vulnerable API endpoint, deploy WAF rules, and monitor for official vendor patches. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2026-1107
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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