CVE

CVE-2026-52774

6.1

CVSSmedium

Exploitable remotely over the internet · no authentication required · user interaction needed.

Description

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, YesWiki's Bazar widget handler reflects the id GET parameter into HTML attributes using strip_tags() only. Because strip_tags() does not escape double quotes, an attacker can break out of the attribute value, inject an event handler such as onmouseover, and execute arbitrary JavaScript in the victim's browser. This issue is reachable without authentication. During validation, the vulnerable widget route returned the injected HTML for both /HomePage/widget?id=... and /NoSuchPage/widget?id=..., which shows that no login, no page ownership, no edit rights, and not even a valid page tag were required. The only routing prerequisite observed was that the Bazar extension is enabled and the request includes an id parameter. This issue has been patched in version 4.6.6.

Attack Vector

Network

Privileges Req.

None

User Interaction

Required

yeswiki

Updated Nov 10, 2026View on NVD →

S4E scanner

mediumWeb Vulnerabilities~10 seconds

YesWiki Bazar Widget - Reflected XSS via 'id' Parameter

YesWiki's Bazar widget handler reflects the id GET parameter into HTML attributes using strip_tags() only. strip_tags() does not escape double quotes, allowing an attacker to break out of the data-formid attribute and inject arbitrary event handlers. References: https://github.com/YesWiki/yeswiki/security/advisories/GHSA-r5xw-gcgw-hwp5 https://nvd.nist.gov/vuln/detail/CVE-2026-52774 Remediation: Upgrade YesWiki to version 4.6.6 or later where output encoding is applied.

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CVE history: yeswiki

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