CVE-2026-1098

CM CSS Columns <= 1.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'tag' Shortcode Attribute

6.4 Medium

The CM CSS Columns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tag' shortcode attribute in all versions up to, and including, 1.2.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.22%Up 0.2 points since Jan 24, 2026

What each source reports

CVE List Score used 6.4

CM CSS Columns <= 1.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'tag' Shortcode Attribute

Record: CVE-2026-1098
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-4562 6.4

Record: EUVD-2026-4562
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-cmc4-6572-9g97 6.4

The CM CSS Columns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tag...

Record: GHSA-cmc4-6572-9g97
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.4

Record: CVE-2026-1098
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

codemacher cm css columns

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-1098 is a medium vulnerability (CVSS 6.4) in Codemacher Cm Css Columns, published January 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. No source names a fixed version.