CVE-2025-54677Network attack vector

Author-level arbitrary file upload via missing validation

Published Aug 20, 2025 · Updated Apr 28, 2026

Arbitrary file upload in vcita Online Booking & Scheduling Calendar 4.5.3 and earlier allows remote authenticated users to upload dangerous files. The upload path accepts attacker-supplied content without file-type validation; public advisories do not identify the affected handler. Author-level WordPress access is required; code execution follows only when the web server processes an uploaded file as executable content.

CVSS severity9.1
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in vcita Online Booking & Scheduling Calendar 4.5.3 and earlier allows remote authenticated users to upload dangerous files. The upload path accepts attacker-supplied content without file-type validation; public advisories do not identify the affected handler. Author-level WordPress access is required; code execution follows only when the web server processes an uploaded file as executable content.

The record

CVE
CVE-2025-54677
Published
Aug 20, 2025
Updated
Apr 28, 2026
Vendor
vcita
Product
Online Booking & Scheduling Calendar for WordPress by vcita
Classifications
CWE-434, CAPEC-17, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=0 <=4.5.3 changes=[{"at":"4.5.5","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

vcita · Online Booking & Scheduling Calendar for WordPress by vcitaversion=0 <=4.5.3 changes=[{"at":"4.5.5","status":"unaffected"}]

Published CVSS scores

9.1PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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.

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-434Unrestricted Upload of File with Dangerous Type
CAPEC-17Using Malicious Files
T1190Exploit Public-Facing Application

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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