CVE-2026-1098Public exploitNetwork attack vector

Stored XSS via unescaped shortcode tag attribute

Published Jan 24, 2026 · Updated Jan 24, 2026

Stored XSS in CM CSS Columns 1.2.1 and earlier allows remote authenticated users to inject scripts through the tag shortcode attribute. The shortcode renderer in includes/Shortcoder.php inserts the user-controlled tag value into generated HTML without sufficient input sanitization or output escaping. Contributor-level access is sufficient, and the stored script executes in the browser whenever a visitor opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.19%
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 CM CSS Columns 1.2.1 and earlier allows remote authenticated users to inject scripts through the tag shortcode attribute. The shortcode renderer in includes/Shortcoder.php inserts the user-controlled tag value into generated HTML without sufficient input sanitization or output escaping. Contributor-level access is sufficient, and the stored script executes in the browser whenever a visitor opens the affected page.

The record

CVE
CVE-2026-1098
Published
Jan 24, 2026
Updated
Jan 24, 2026
Vendor
codemacher
Product
CM CSS Columns
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 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?

codemacher · CM CSS Columnsversion=* <=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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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