CVE-2026-22205·PHP vulnerability
SPIP versions prior to 4.4.10 contain an authentication bypass vulnerability caused by PHP type juggling that allows unauthenticated attackers to access protected information. Attackers can exploit loose type comparisons in authentication logic to bypass login verification and retrieve sensitive internal data.
- Severity
- high
- Software
- PHP
- Fixed in
- 4.4.10
- Published
- 2026-02-26
Affected versions
Until: 4.4.10
Fixed in: 4.4.10
How to fix this CVE
Update PHP to version 4.4.10 or later to patch the authentication bypass vulnerability caused by insecure type juggling in login verification. This fix closes the gap that allows unauthenticated attackers to bypass authentication and access restricted internal data without proper credentials. Apply security updates immediately if you are running SPIP versions prior to 4.4.10.
sudo dnf update phpDefensia detects this vulnerability
What an exploitation attempt looks like
Sample log line indicative of exploitation attempts:
POST /index.php HTTP/1.1 with authentication bypass payloads targeting loosely-typed comparisons (e.g., requests with integer/string mismatches in session tokens or login parameters); monitor for successful 200 responses to admin endpoints from unauthenticated sessionsWAF mitigation (if patching is not yet possible)
Add this rule to your WAF to block exploitation attempts while you schedule the patch.
Implement strict input validation and type checking rules at the WAF level to reject authentication requests with suspicious type mismatches; enforce Content-Type validation for API endpoints and log all authentication failures for reviewHow to check if you are affected
- Run `php -v` to display the installed PHP version and compare against version 4.4.10
- Check if SPIP is exposed on public endpoints by testing unauthenticated access to admin or protected API endpoints
- Review web server access logs for unusual authentication attempts or requests to sensitive endpoints from unauthenticated sources (grep for paths like /admin, /api/users, /internal)
- Verify the patch was applied by re-running `php -v` and confirming the version is 4.4.10 or higher, then restart PHP-FPM or your web server with `sudo systemctl restart php-fpm` or equivalent
FAQ
What is CVE-2026-22205?
CVE-2026-22205 is an authentication bypass vulnerability in SPIP versions before 4.4.10 that exploits PHP type juggling weaknesses in login validation logic, allowing attackers to access protected information without valid credentials.
Is CVE-2026-22205 being actively exploited?
No, this vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are available, but organizations should still prioritize patching due to the high severity rating.
What versions of PHP are affected by CVE-2026-22205?
SPIP versions up to and including 4.4.9 are affected; version 4.4.10 and later include the security patch.
How do I check if my server is vulnerable to CVE-2026-22205?
Run `php -v` to check the installed version; if it is below 4.4.10, your server is vulnerable. Additionally, attempt to access restricted SPIP endpoints without authentication to confirm exposure.
Does Defensia detect CVE-2026-22205?
Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If PHP is installed on a monitored server, CVE-2026-22205 will appear in your dashboard with remediation steps.
Related PHP CVEs
References
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