CVE-2026-104471: YesWiki before 4.6.7 Unrestricted File Upload via Bazar CSV Import

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-02 · updated 2026-10-02
Weakness: CWE-434

Description

YesWiki before 4.6.7 contains an unrestricted file upload vulnerability that allows authenticated admins to write remote files into the web-accessible files/ directory via Bazar CSV import preview. Attackers can import a CSV whose file or image field references a remote .php URL, which is saved without extension checks and executed as server-side code.

Affected products

yeswiki: before 4.6.7 — fixed in 4.6.7

How to fix

Upgrade to a fixed version: yeswiki 4.6.7. Check the vendor advisory for mitigations.

References

https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v3gq-c7c6-mxw3
https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-unrestricted-file-upload-via-bazar-csv-import
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v3gq-c7c6-mxw3

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