CVE-2026-52773Public exploitNetwork attack vector

Reflected XSS via unescaped archived-revision time parameter

Published Sep 4, 2026 · Updated Sep 4, 2026

Reflected XSS in YesWiki 4.1.0 through 4.6.5 allows remote attackers to execute JavaScript through a crafted archived-revision URL. The archived-revision form in handlers/page/show.php writes the time GET parameter into a hidden input without HTML escaping after MySQL coerces an appended payload to a valid revision timestamp. A victim must open the link and have read and write access to a page with an archived revision; anonymous public pages satisfy that gate in the validated default configuration.

CVSS severity6.1
Medium
EPSS probability0.48%
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 YesWiki 4.1.0 through 4.6.5 allows remote attackers to execute JavaScript through a crafted archived-revision URL. The archived-revision form in handlers/page/show.php writes the time GET parameter into a hidden input without HTML escaping after MySQL coerces an appended payload to a valid revision timestamp. A victim must open the link and have read and write access to a page with an archived revision; anonymous public pages satisfy that gate in the validated default configuration.

The record

CVE
CVE-2026-52773
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
YesWiki
Product
YesWiki
Classifications
CWE-80, CWE-79, 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=>= 4.1.0, < 4.6.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YesWiki · YesWikiversion=>= 4.1.0, < 4.6.6

Published CVSS scores

6.1GitHub Advisory DatabaseCVSS: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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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