# CVE-2026-9833: Tag Groups < 2.2.0 - Reflected XSS via 'tag_groups_task' Parameter

> Unauthenticated attackers can execute arbitrary JavaScript in the browser of logged-in editors via a crafted link, potentially leading to account takeover.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Jul 2026
- **Updated:** 20 Jul 2026
- **Also known as:** GHSA-mcx6-9qf4-cx6p

## What is CVE-2026-9833?

CVE-2026-9833 is a high-severity cross-site scripting vulnerability in Unknown Tag Groups is the Advanced Way to Display Your Taxonomy Terms, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Tag Groups is the Advanced Way to Display Your Taxonomy Terms WordPress plugin before 2.2.0 does not properly escape one of its AJAX parameters before reflecting it in the response body served with an HTML content type, allowing unauthenticated attackers to execute arbitrary JavaScript in the browser of a logged-in user with `edit_pages` capability (Editor or higher) who is tricked into following a crafted link.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-9833?


## How do I fix CVE-2026-9833?

No fix has been published for CVE-2026-9833 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9833 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9833 exists.

Public exploit code:

- https://github.com/aj2108/CVE-2026-9833 (github_poc): https://github.com/aj2108/CVE-2026-9833
- WordPress Tag Groups < 2.2.0 - Reflected Cross-Site Scripting (nuclei): http/cves/2026/CVE-2026-9833.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9833 and fix it if it is affected.

What it is: CVE-2026-9833 is a high-severity cross-site scripting vulnerability in Unknown Tag Groups is the Advanced Way to Display Your Taxonomy Terms, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, 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-2026-9833 exists.

Affected product: Unknown Tag Groups is the Advanced Way to Display Your Taxonomy Terms. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-9833/ (Markdown: https://insights.sbomify.com/CVE-2026-9833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9833
- OSV: https://osv.dev/vulnerability/CVE-2026-9833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9833/
Summaries are generated and may contain mistakes; the official description above is the record.