CVE-2026-104455
Deferred Deferred - Pending Action

YesWiki Access Control Bypass via Recentchangesrssplus RSS Action

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: VulnCheck

Description
YesWiki before 4.6.7 contains an access control bypass vulnerability that allows unauthenticated attackers to read restricted page content via the recentchangesrssplus RSS action. Attackers can request the xml method of a page hosting the action to retrieve 500-character body excerpts of every latest page, including read-restricted drafts and notes.

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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-2026-104455
EUVD
EUVD-2026-91466

Affected Vendors & Products

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

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This vulnerability is an access control bypass in YesWiki versions before 4.6.7. It allows unauthenticated attackers to read restricted page content by exploiting the recentchangesrssplus RSS action. Attackers can request the xml method of a page hosting this action to retrieve 500-character excerpts of every latest page, including read-restricted drafts and notes.

Detection Guidance

To detect this vulnerability, check if your YesWiki instance uses the recentchangesrssplus action and is running version 4.6.6 or earlier. Inspect network traffic for GET requests to the xml endpoint of pages with recentchangesrssplus, as these may leak restricted content.

Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive information. Attackers can access restricted content such as drafts or notes without authentication. The impact includes potential exposure of confidential data, which could be used for further attacks or privacy violations.

Compliance Impact

This vulnerability could violate compliance with GDPR and HIPAA by exposing sensitive personal or health information to unauthorized parties. GDPR requires protection of personal data, while HIPAA mandates safeguards for protected health information. Unauthorized access risks non-compliance and potential legal penalties.

Mitigation Strategies

Immediately upgrade YesWiki to version 4.6.7 or later. If upgrading is not possible, remove or disable the recentchangesrssplus action from your instance to prevent exploitation.

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