CVE-2026-104473
Deferred Deferred - Pending Action

Reflected XSS in YesWiki Prior to 4.5.3

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: VulnCheck

Description
YesWiki before 4.5.3 contains multiple reflected cross-site scripting vulnerabilities that allow remote attackers to inject JavaScript through unsanitized parameters such as incomingurl, id, file, tags, and template. Attackers can lure authenticated or unauthenticated users into opening crafted links to hijack sessions and trigger authenticated requests against backend functionality.

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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-2026-104473
EUVD
EUVD-2026-91396

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
yeswiki yeswiki to 4.5.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

YesWiki before version 4.5.3 has multiple reflected cross-site scripting (XSS) vulnerabilities. These allow attackers to inject JavaScript code through unsanitized parameters like incomingurl, id, file, tags, and template. When users click crafted links, the injected script executes in their browser, potentially hijacking sessions or performing unauthorized actions.

Detection Guidance

To detect this vulnerability, inspect YesWiki instances for versions prior to 4.5.3. Check for unsanitized parameters like incomingurl, id, file, tags, and template in requests. Monitor for unusual JavaScript execution or session hijacking attempts.

Impact Analysis

This vulnerability can lead to session hijacking where attackers steal user sessions to impersonate victims. It may also enable unauthorized actions on the victim's behalf, such as modifying data or triggering backend requests. Attackers can combine this with other vulnerabilities to escalate access or achieve remote code execution.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA due to the risk of session hijacking and unauthorized actions. Reflected XSS attacks may allow attackers to steal session cookies or sensitive data, which could lead to breaches of confidentiality required by these regulations. However, the provided context does not explicitly detail compliance impacts.

Mitigation Strategies

Immediately update YesWiki to version 4.5.3 or later. If updating is not possible, apply input sanitization for the vulnerable parameters. Restrict access to sensitive functionality until patched.

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