What’s Vulnerable › Vulnerabilities

CVE-2025-46348: YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-29 · updated 2026-06-17
• Weakness: CWE-287

Description

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.

Affected products

• yeswiki: before 4.5.4 — fixed in 4.5.4

How to fix

Upgrade to a fixed version: yeswiki 4.5.4. Check the vendor advisory for mitigations.

References

• https://github.com/YesWiki/yeswiki/commit/0d4efc880a727599fa4f6d7a64cc967afe475530
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-wc9g-6j9w-hr95
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-wc9g-6j9w-hr95

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