critical CVSS 10

CVE-2025-46348·PHP vulnerability

YesWiki is a wiki system written in PHP. Prior to version 4.5.4, the request to commence a site backup can be performed and downloaded without authentication. The archives are created with a predictable filename, so a malicious user could create and download an archive without being authenticated. This could result in a malicious attacker making numerous requests to create archives and fill up the file system, or by downloading the archive which contains sensitive site information. This issue has been patched in version 4.5.4.

Severity
critical
Software
PHP
Fixed in
4.5.4
Published
2025-04-29

Affected versions

Until: 4.5.4

Fixed in: 4.5.4

How to fix this CVE

Update YesWiki to version 4.5.4 or later to patch an authentication bypass in the backup functionality. If you are running YesWiki on a PHP-based system, ensure your installation is upgraded immediately, as unauthenticated attackers can request backup archives with predictable filenames, potentially exposing sensitive data or exhausting disk space. Verify the patch by checking your YesWiki version in the admin panel or installation directory.

sudo dnf update php

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

POST|GET /.*backup.*|/.*export.* HTTP/[0-9.]+ .*?(without|no) (authentication|authorization|session|cookie)

WAF mitigation (if patching is not yet possible)

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

Block unauthenticated requests to backup and export endpoints by requiring valid session tokens or authentication headers. Implement rate limiting on backup request endpoints to prevent denial-of-service attacks via repeated archive generation. Example: ModSecurity rule blocking /backup or /export requests without valid session ID header or cookie.

How to check if you are affected

  1. Step 1: Check your YesWiki version by navigating to the admin panel or inspecting the VERSION file in the installation root: cat /path/to/yeswiki/VERSION
  2. Step 2: Verify if backup export functionality is exposed by testing unauthenticated access to the backup endpoint (typically /yeswiki/?action=backup or similar without session cookies)
  3. Step 3: Search web server logs for repeated requests to backup/export endpoints from unknown IP addresses: grep -i 'backup\|export' /var/log/apache2/access.log or /var/log/nginx/access.log
  4. Step 4: Confirm the patch by re-checking the YesWiki version and verifying that backup requests now require valid authentication credentials

FAQ

What is CVE-2025-46348?

CVE-2025-46348 is a critical authentication bypass vulnerability in YesWiki's backup export feature that allows unauthenticated users to request and download site backups due to predictable filename generation, potentially leaking sensitive data or causing denial of service through repeated archive creation.

Is CVE-2025-46348 being actively exploited?

As of the latest available data, CVE-2025-46348 is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog and no public exploit code has been released, though the vulnerability is trivial to exploit and poses immediate risk.

What versions of YesWiki are affected by CVE-2025-46348?

All versions of YesWiki prior to version 4.5.4 are affected; version 4.5.4 and later contain the authentication check required to remediate this issue.

How do I check if my server is vulnerable to CVE-2025-46348?

Run `cat /path/to/yeswiki/VERSION` to determine your installed version, or check the admin panel settings page. If the version is below 4.5.4, your instance is vulnerable and requires immediate patching.

Does Defensia detect CVE-2025-46348?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If YesWiki or PHP is installed on a monitored server, CVE-2025-46348 will appear in your dashboard with remediation steps.

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References

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