CVE-2026-3554Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode title

Published Mar 21, 2026 · Updated Mar 21, 2026

Stored XSS in SherkSpear Sherk Custom Post Type Displays 1.2.1 and earlier allows remote authenticated users to run scripts in visitors' browsers. The sherkcptdisplays_func() handler takes the title value returned by shortcode_atts() and concatenates it directly into an HTML h2 element without sanitization or output escaping. Contributor-level access is required to store the crafted shortcode, and the script executes when a visitor opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.20%
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 SherkSpear Sherk Custom Post Type Displays 1.2.1 and earlier allows remote authenticated users to run scripts in visitors' browsers. The sherkcptdisplays_func() handler takes the title value returned by shortcode_atts() and concatenates it directly into an HTML h2 element without sanitization or output escaping. Contributor-level access is required to store the crafted shortcode, and the script executes when a visitor opens the affected page.

The record

CVE
CVE-2026-3554
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
SherkSpear
Product
Sherk Custom Post Type Displays
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 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=* <=1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SherkSpear · Sherk Custom Post Type Displaysversion=* <=1.2.1

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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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