CVE-2025-6553Network attack vector

Unauthenticated arbitrary file upload via checkout handler

Published Oct 11, 2025 · Updated Apr 8, 2026

Arbitrary file upload in OvaTheme's Ovatheme Events Manager 1.8.5 and earlier allows remote attackers to place files on the server. The process_checkout() function accepts uploaded checkout files without validating their file types before storing them. No authentication is required; server-side execution depends on the web server treating an uploaded file as executable code.

CVSS severity9.8
Critical
EPSS probability0.76%
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 OvaTheme's Ovatheme Events Manager 1.8.5 and earlier allows remote attackers to place files on the server. The process_checkout() function accepts uploaded checkout files without validating their file types before storing them. No authentication is required; server-side execution depends on the web server treating an uploaded file as executable code.

The record

CVE
CVE-2025-6553
Published
Oct 11, 2025
Updated
Apr 8, 2026
Vendor
OvaTheme
Product
Ovatheme Events Manager
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=1.8.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OvaTheme · Ovatheme Events Managerversion=0 <=1.8.5

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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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