CVE-2026-104472
Deferred Deferred - Pending Action

Missing Authorization in YesWiki Allows Unauthenticated File Access

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: VulnCheck

Description
YesWiki before 4.6.7 contains a missing authorization vulnerability in the attachment download handler that allows unauthenticated attackers to bypass page read ACLs. Attackers can request the download handler with a known page tag and file parameter to retrieve confidential attachments from read-restricted pages.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-104472
EUVD
EUVD-2026-91395

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
yeswiki yeswiki to 4.6.7 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

YesWiki before version 4.6.7 has a missing authorization vulnerability in the attachment download handler. Unauthenticated attackers can bypass page read ACLs by requesting the download handler with a known page tag and file parameter to retrieve confidential attachments from read-restricted pages.

Detection Guidance

Check YesWiki versions before 4.6.7. Inspect web server logs for suspicious download handler requests with known page tags and file parameters. Look for unauthorized file access attempts in access logs.

Impact Analysis

Attackers can access sensitive files from restricted pages if they know the page tag and attachment filename. This could lead to unauthorized data exposure, confidentiality breaches, and potential misuse of confidential information.

Compliance Impact

This vulnerability may violate compliance requirements like GDPR or HIPAA by allowing unauthorized access to sensitive data. It undermines data protection controls and could result in regulatory penalties due to unauthorized data exposure.

Mitigation Strategies

Upgrade YesWiki to version 4.6.7 or later immediately. If upgrading is not possible, restrict access to the attachment download handler endpoint or disable it until patched.

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