Summary
YesWiki Vulnerable to Reflected XSS via Unescaped id Parameter in Bazar Widget HTML Attributes
Impact
This is a reflected XSS vulnerability in the Bazar widget handler with very low attacker prerequisites.
The practical access model is:
- The attacker only needs to send a crafted public URL.
- The victim does not need to authenticate.
- The attacker does not need edit rights, ownership, or a valid page tag.
- The route only needs to be reachable on a YesWiki instance with Bazar enabled.
An attacker may be able to:
- Execute arbitrary JavaScript in the victim's browser.
- Steal browser-accessible sensitive data.
- Perform actions in the victim's session if the victim is logged in.
- Target public visitors and authenticated users alike because the route is reachable without access-control checks.
CVE-2026-52774 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.6.6); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2026-52774? CVE-2026-52774 is a medium-severity security vulnerability in yeswiki/yeswiki (composer), affecting versions < 4.6.6. It is fixed in 4.6.6.
- How severe is CVE-2026-52774? CVE-2026-52774 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of yeswiki/yeswiki are affected by CVE-2026-52774? yeswiki/yeswiki (composer) versions < 4.6.6 is affected.
- Is there a fix for CVE-2026-52774? Yes. CVE-2026-52774 is fixed in 4.6.6. Upgrade to this version or later.
- Is CVE-2026-52774 exploitable, and should I be worried? Whether CVE-2026-52774 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-52774 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-52774? Upgrade
yeswiki/yeswikito 4.6.6 or later.