CVE-2026-57661Network attack vector

Subscriber-level unauthorized action via completion handling

Published Jun 26, 2026 · Updated Jun 26, 2026

Missing authorization in Nexcess WPComplete 2.9.5.5 and earlier allows remote authenticated users to perform an unauthorized action. Published evidence narrows the locus to completion-button handling but does not identify the affected function or the authorization check it omits. Subscriber-level WordPress access is required; the unspecified action can alter data and interrupt service but does not disclose data.

CVSS severity5.4
Medium
EPSS probability0.29%
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 Nexcess WPComplete 2.9.5.5 and earlier allows remote authenticated users to perform an unauthorized action. Published evidence narrows the locus to completion-button handling but does not identify the affected function or the authorization check it omits. Subscriber-level WordPress access is required; the unspecified action can alter data and interrupt service but does not disclose data.

The record

CVE
CVE-2026-57661
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
The Events Calendar
Product
WPComplete
Classifications
CWE-862, CAPEC-180
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 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=n/a <=2.9.5.5 changes=[{"at":"2.9.5.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Events Calendar · WPCompleteversion=n/a <=2.9.5.5 changes=[{"at":"2.9.5.6","status":"unaffected"}]

Published CVSS scores

5.4PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels

Public exploit references

No public exploit references are available in this record.

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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