CVE-2026-52774
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 42% of all known CVEs.
References
Related Vulnerabilities
Other CWE-80 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-21145 | Medium | 4.8 | 78% | - | - |
| CVE-2020-13562 | Medium | 6.1 | 78% | - | - |
| CVE-2020-13965 | Medium | 6.1 | 77% | KEV | Fix |
| CVE-2020-13564 | Medium | 6.1 | 76% | - | - |
| CVE-2020-13563 | Medium | 6.1 | 76% | - | - |
| CVE-2024-4439 | High | 7.2 | 71% | - | Fix |
Common questions
How do I fix CVE-2026-52774?
No published fix for CVE-2026-52774 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-52774 being actively exploited?
Not that we know of. CVE-2026-52774 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.51% is the estimated probability that it will be exploited in the next 30 days. That is higher than 42% of all scored CVEs.
How severe is CVE-2026-52774?
CVE-2026-52774 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-08.