CVE-2026-6246Network attack vector

Stored XSS via unescaped shortcode width attribute

Published Apr 22, 2026 · Updated Apr 22, 2026

Stored XSS in Simple Random Posts Shortcode 0.3 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The simple_random_posts shortcode inserts the user-controlled container_right_width value into rendered HTML without sanitizing the attribute or escaping its output. Contributor-level access is required to store the payload in page content, and the script runs when a visitor opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Simple Random Posts Shortcode 0.3 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The simple_random_posts shortcode inserts the user-controlled container_right_width value into rendered HTML without sanitizing the attribute or escaping its output. Contributor-level access is required to store the payload in page content, and the script runs when a visitor opens the affected page.

The record

CVE
CVE-2026-6246
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
Matthias Kerstner
Product
Simple Random Posts Shortcode
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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 <=0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Matthias Kerstner · Simple Random Posts Shortcodeversion=0 <=0.3

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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