high CVSS 8.6 Public exploit available

CVE-2025-31131·PHP vulnerability

YesWiki is a wiki system written in PHP. The squelette parameter is vulnerable to path traversal attacks, enabling read access to arbitrary files on the server. This vulnerability is fixed in 4.5.2.

Severity
high
Software
PHP
Fixed in
4.5.2
Published
2025-04-01

Affected versions

Until: 4.5.2

Fixed in: 4.5.2

How to fix this CVE

Update YesWiki to version 4.5.2 or later to remediate the squelette parameter path traversal vulnerability. This vulnerability allows unauthenticated attackers to read sensitive files from your server by manipulating the squelette parameter. Ensure all PHP dependencies are updated through your system package manager and verify the update was applied before considering the system patched.

sudo dnf upgrade php

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

GET|POST.*squelette=([^\s]*)(\.\.[\/\\])+

WAF mitigation (if patching is not yet possible)

Add this rule to your WAF to block exploitation attempts while you schedule the patch. 

Block HTTP requests containing the squelette parameter with path traversal sequences (../ or ..\ or encoded variants like %2e%2e%2f). Implement a rule to reject any squelette parameter value containing dots followed by slashes or backslashes.

How to check if you are affected

  1. Check installed PHP version: php -v
  2. Verify YesWiki version by examining the /yeswiki/version or checking the composer.lock file for the yeswiki package version constraint
  3. Search web server logs for squelette parameter requests with path traversal patterns: grep -i 'squelette.*\.\./' /var/log/apache2/access.log or /var/log/nginx/access.log
  4. Confirm the fix by re-running php -v and verifying YesWiki is running version 4.5.2 or later via the application's about page or composer show yeswiki/yeswiki

Indicators of compromise

  • squelette parameter in query string or POST body with ../ or ..\
  • Requests attempting to access /etc/passwd, /etc/shadow, or /config/ through squelette parameter
  • YesWiki installations running versions prior to 4.5.2

FAQ

What is CVE-2025-31131?

CVE-2025-31131 is a path traversal vulnerability in YesWiki's squelette parameter that permits unauthenticated remote users to bypass access controls and read arbitrary files from the affected server. This exposure poses a critical information disclosure risk for sensitive configuration files and credentials.

Is CVE-2025-31131 being actively exploited?

While CVE-2025-31131 is not currently listed on CISA's Known Exploited Vulnerabilities catalog, public exploits are available on Exploit-DB, making exploitation straightforward for attackers. Immediate patching is recommended.

What versions of PHP are affected by CVE-2025-31131?

All versions of YesWiki prior to 4.5.2 are affected. The vulnerability exists in the squelette parameter handling regardless of PHP version, but upgrading YesWiki to 4.5.2 or later eliminates the risk.

How do I check if my server is vulnerable to CVE-2025-31131?

Run composer show yeswiki/yeswiki to check the installed YesWiki version. If the version is below 4.5.2, your system is vulnerable. Additionally, test the squelette parameter with a payload like ?squelette=../../../../etc/passwd in your YesWiki URL to confirm exposure.

Does Defensia detect CVE-2025-31131?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If YesWiki is installed on a monitored server, CVE-2025-31131 will appear in your dashboard with remediation steps.

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References

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