CVE-2026-52772Public exploitNetwork attack vector

Stored XSS via unescaped Bazar field metadata

Published Sep 4, 2026 · Updated Sep 4, 2026

Stored XSS in YesWiki before 4.6.6 allows remote authenticated users to execute JavaScript in visitors' browsers through Bazar forms. Bazar's Twig templates pass field.label and field.hint through raw filters, disabling contextual escaping so quotes or HTML create event handlers and script elements. Form-definition privileges, restricted to administrators by default, are required to plant a payload; rendering the affected form then exposes visitor sessions and page content.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in YesWiki before 4.6.6 allows remote authenticated users to execute JavaScript in visitors' browsers through Bazar forms. Bazar's Twig templates pass field.label and field.hint through raw filters, disabling contextual escaping so quotes or HTML create event handlers and script elements. Form-definition privileges, restricted to administrators by default, are required to plant a payload; rendering the affected form then exposes visitor sessions and page content.

The record

CVE
CVE-2026-52772
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
YesWiki
Product
YesWiki
Classifications
CWE-116, CWE-79, T1059.007
Attack vector
network
Privileges
admin

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 privilegesadmin

What is affected?

YesWiki · YesWikiversion=< 4.6.6

Published CVSS scores

5.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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