CVE-2026-52774Public exploitNetwork attack vector

Reflected XSS via unescaped Bazar widget attributes

Published Sep 4, 2026 · Updated Sep 4, 2026

Reflected XSS in the Bazar widget handler in YesWiki before 4.6.6 allows remote attackers to execute JavaScript via a crafted URL. The widget template inserts the id GET parameter into data-formid and data-iframeUrl attributes after strip_tags(), which leaves double quotes unescaped and permits attacker-controlled event-handler attributes. Exploitation requires Bazar to be enabled and a victim to open the URL; injected script runs in the YesWiki origin and can access browser-visible data or act through an authenticated victim's session.

CVSS severity6.1
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the Bazar widget handler in YesWiki before 4.6.6 allows remote attackers to execute JavaScript via a crafted URL. The widget template inserts the id GET parameter into data-formid and data-iframeUrl attributes after strip_tags(), which leaves double quotes unescaped and permits attacker-controlled event-handler attributes. Exploitation requires Bazar to be enabled and a victim to open the URL; injected script runs in the YesWiki origin and can access browser-visible data or act through an authenticated victim's session.

The record

CVE
CVE-2026-52774
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
YesWiki
Product
YesWiki
Classifications
CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.6.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YesWiki · YesWikiversion=< 4.6.6

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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