CVE-2026-52766Public exploitNetwork attack vector

Unauthenticated page deletion via unchecked cleanup action

Published Sep 4, 2026 · Updated Sep 4, 2026

Missing authorization in YesWiki before 4.6.6 allows remote attackers to permanently delete arbitrary wiki pages through crafted POST requests. The erasespamedcomments action accepts suppr[] page tags and calls PageController::delete without authorization, while PageManager::deleteOrphaned performs unconditional database deletions. Fresh installations grant page write access to everyone by default, so unauthenticated requests can erase front, administrative, and other users' pages.

CVSS severity9.1
Critical
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in YesWiki before 4.6.6 allows remote attackers to permanently delete arbitrary wiki pages through crafted POST requests. The erasespamedcomments action accepts suppr[] page tags and calls PageController::delete without authorization, while PageManager::deleteOrphaned performs unconditional database deletions. Fresh installations grant page write access to everyone by default, so unauthenticated requests can erase front, administrative, and other users' pages.

The record

CVE
CVE-2026-52766
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
YesWiki
Product
YesWiki
Classifications
CWE-862, CWE-276, T1485, T1190
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

9.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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-862Missing Authorization
CWE-276Incorrect Default Permissions
T1485Data Destruction
T1190Exploit Public-Facing Application

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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