CVE-2025-12813Network attack vector

Unauthenticated PHP execution via unsanitized cache contents

Published Nov 11, 2025 · Updated Nov 11, 2025

Code injection in Strix Holiday class post calendar 7.1 and earlier allows remote attackers to execute PHP through the contents parameter. The plugin writes the parameter's unsanitized value into a cache file that the WordPress server can execute as PHP. No authentication or user interaction is required, and successful exploitation grants code execution under the WordPress server process.

CVSS severity9.8
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Strix Holiday class post calendar 7.1 and earlier allows remote attackers to execute PHP through the contents parameter. The plugin writes the parameter's unsanitized value into a cache file that the WordPress server can execute as PHP. No authentication or user interaction is required, and successful exploitation grants code execution under the WordPress server process.

The record

CVE
CVE-2025-12813
Published
Nov 11, 2025
Updated
Nov 11, 2025
Vendor
Strix
Product
Holiday class post calendar
Classifications
CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 2025Record 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=* <=7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Strix · Holiday class post calendarversion=* <=7.1

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-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

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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