Is CVE-2026-12202 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-12202 being exploited in the wild.

How severe is CVE-2026-12202?

Low severity, with a CVSS score of 3.1, published 15 June 2026.

Which products and versions are affected?

Intelliants Subrion CMS <= 4.0.3, up to 4.0.3; intelliants/subrion (Packagist) <= 4.0.3, ECOSYSTEM:introduced=0,last_affected=4.0.3.

Is there a fix for CVE-2026-12202?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-12202 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-12202?

Check whether you run Intelliants Subrion CMS or intelliants/subrion (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-12202: Intelliants Subrion CMS stored XSS in Blocks Endpoint

Q: Is there a fix for CVE-2026-12202?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-12202 attacked?

It is attacked over the network, in a web application.

Q: Am I affected by CVE-2026-12202?

Check whether you run Intelliants Subrion CMS or intelliants/subrion (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-12202 · Severity: low · CVSS 3.1 · Published 2026-06-15

Subrion CMS is a web content management system used to build and manage websites. A stored XSS vulnerability in the admin panel's Blocks management feature allows an authenticated administrator to inject malicious code that will execute for other users viewing the website. This could lead to session hijacking, credential theft, malware distribution, or website defacement for all site visitors.

Technologies: Intelliants Subrion CMS, intelliants/subrion (Packagist). Vendors: Intelliants, Packagist.

Quick answers

Is CVE-2026-12202 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-12202 being exploited in the wild.
How severe is CVE-2026-12202?: Low severity, with a CVSS score of 3.1, published 15 June 2026.
Which products and versions are affected?: Intelliants Subrion CMS <= 4.0.3, up to 4.0.3; intelliants/subrion (Packagist) <= 4.0.3, ECOSYSTEM:introduced=0,last_affected=4.0.3.
Is there a fix for CVE-2026-12202?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-12202 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-12202?: Check whether you run Intelliants Subrion CMS or intelliants/subrion (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a stored cross-site scripting (CWE-79) flaw in the Blocks endpoint of Subrion CMS. The CSS class name field fails to properly validate and sanitize user input before storing it in the database. An authenticated attacker with administrative privileges (Privileges Required: High) can inject arbitrary HTML and JavaScript into this field via the admin dashboard. The malicious payload is stored server-side and automatically executed in the browsers of any user accessing pages that render the block, without requiring user interaction beyond normal site browsing. No patch has been released as the vendor did not respond to early disclosure. The exploit has been publicly disclosed with proof-of-concept documentation available.

Affected products

Intelliants Subrion CMS <= 4.0.3

Identifiers

CVE-2026-12202
GHSA-wrcg-234w-hfhq

Timeline

2026-06-15: disclosed: Vulnerability published to GitHub Advisory Database and NVD
2026-08-25: advisory: GitHub Security Advisory review completed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.