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

> Remote attackers can inject malicious scripts via the Blocks Endpoint CSS class name in Subrion CMS, potentially leading to code execution or account takeover.

- **Severity:** Medium 4.8 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Jun 2026
- **Updated:** 16 Jun 2026
- **Also known as:** GHSA-wrcg-234w-hfhq

## What is CVE-2026-12202?

CVE-2026-12202 is a medium-severity cross-site scripting vulnerability in Intelliants Subrion CMS, published on 15 Jun 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-12202?

2 open source packages ship an affected version, including intelliants/subrion.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `intelliants/subrion` | Packagist | All versions to 4.0.3 | None |
| `intelliants/subrion` | Packagist | All versions to 4.0.3 | None |

## How do I fix CVE-2026-12202?

No fix has been published for CVE-2026-12202 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12202 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12202 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12202 and fix it if it is affected.

What it is: CVE-2026-12202 is a medium-severity cross-site scripting vulnerability in Intelliants Subrion CMS, published on 15 Jun 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12202 exists.

Affected packages and fixed versions:
- intelliants/subrion (Packagist): affected all versions up to 4.0.3; no fix listed
- intelliants/subrion (Packagist): affected all versions up to 4.0.3; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12202/ (Markdown: https://insights.sbomify.com/CVE-2026-12202/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12202
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12202
- OSV: https://osv.dev/vulnerability/CVE-2026-12202

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12202/
Summaries are generated and may contain mistakes; the official description above is the record.