# CVE-2026-126559: Semantic MediaWiki 4.2.0 before 7.4.1 Stored XSS via Special:FacetedSearch

> Users with schema edit rights can store scripts in faceted search profiles that run for every visitor including administrators; Semantic MediaWiki operators should care.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **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
- **Harmful if only installed:** No
- **Needs a specific call:** No
- **Fix available:** No
- **Published:** 11 Nov 2026
- **Updated:** 11 Nov 2026
- **Also known as:** GHSA-76rx-vmjx-f4fq, GHSA-cw86-j46r-2x7x

## What is CVE-2026-126559?

CVE-2026-126559 is a medium-severity cross-site scripting vulnerability in SemanticMediaWiki, published on 11 Nov 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Semantic MediaWiki 4.2.0 before 7.4.1 contains a stored cross-site scripting vulnerability in OptionsBuilder::profiles() that allows users with the smw-schemaedit right to inject markup. Attackers can save FACETEDSEARCH_PROFILE_SCHEMA profile keys or labels that break out of option elements, executing scripts for every Special:FacetedSearch visitor including administrators.

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

## Which versions are affected by CVE-2026-126559?

An affected version is exposed as installed. No special setting or call is needed.


## How do I fix CVE-2026-126559?

No fix has been published for CVE-2026-126559 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-126559 being exploited?

There is no known exploitation of CVE-2026-126559 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-126559 and fix it if it is affected.

What it is: CVE-2026-126559 is a medium-severity cross-site scripting vulnerability in SemanticMediaWiki, published on 11 Nov 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-126559 in the wild and no public exploit code.
Exposure: An affected version is exposed as installed. No special setting or call is needed.

Affected product: SemanticMediaWiki. 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-2026-126559/ (Markdown: https://insights.sbomify.com/CVE-2026-126559/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-126559
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126559
- OSV: https://osv.dev/vulnerability/CVE-2026-126559

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-126559/
Summaries are generated and may contain mistakes; the official description above is the record.