CVE-2025-9519Network attack vector

Authenticated code execution via unrestricted shortcode filters

Published Sep 4, 2025 · Updated Apr 8, 2026

Code injection in Kleor Easy Timer 4.2.1 and earlier allows remote authenticated users to execute code through shortcode attributes. Shortcode handlers accept a user-controlled filter attribute and invoke its named PHP functions without requiring them in the KLEOR_FILTERS allowlist. Editor-level access is required, and successful exploitation runs attacker-selected code with the WordPress server process's privileges.

CVSS severity7.2
High
EPSS probability0.91%
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 Kleor Easy Timer 4.2.1 and earlier allows remote authenticated users to execute code through shortcode attributes. Shortcode handlers accept a user-controlled filter attribute and invoke its named PHP functions without requiring them in the KLEOR_FILTERS allowlist. Editor-level access is required, and successful exploitation runs attacker-selected code with the WordPress server process's privileges.

The record

CVE
CVE-2025-9519
Published
Sep 4, 2025
Updated
Apr 8, 2026
Vendor
Kleor
Product
Easy Timer
Classifications
CWE-94, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 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 <=4.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kleor · Easy Timerversion=0 <=4.2.1

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
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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