# CVE-2026-27147: GetSimple CMS: Stored Cross-Site Scripting (XSS) via SVG File Upload (Authenticated)

> Authenticated attackers can upload malicious SVG files to execute JavaScript in victim browsers via stored XSS in GetSimple CMS.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-5gmq-hrcx-6w45

## What is CVE-2026-27147?

CVE-2026-27147 is a medium-severity cross-site scripting vulnerability in GetSimpleCMS-CE, published on 20 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

GetSimple CMS is a content management system. All versions of GetSimple CMS are vulnerable to XSS through SVG file uploads. Authenticated users can upload SVG files via the administrative upload functionality, but they are not properly sanitized or restricted, allowing an attacker to embed malicious JavaScript. When the uploaded SVG file is accessed, the script executes in the browser. This issue does not have a fix at the time of publication.

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

## Which versions are affected by CVE-2026-27147?

It affects 1 product.


Products: Getsimple-Ce Getsimple Cms.

## How do I fix CVE-2026-27147?

No fix has been published for CVE-2026-27147 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27147 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27147 exists.

## Other vulnerabilities in GetSimpleCMS-CE

- [CVE-2024-55085](https://insights.sbomify.com/CVE-2024-55085/): Code injection in n/a (critical 9.8)
- [CVE-2026-28495](https://insights.sbomify.com/CVE-2026-28495/): GetSimple CMS has CSRF to Remote Code Execution via Arbitrary PHP Write in gsconfig.php (critical 9.7)
- [CVE-2026-27202](https://insights.sbomify.com/CVE-2026-27202/): GetSimple CMS: Uploaded Files (feature) Arbitrary File Read Vulnerability (high 8.8)
- [CVE-2024-55088](https://insights.sbomify.com/CVE-2024-55088/): Server-side request forgery in n/a (high 8.8)
- [CVE-2026-27161](https://insights.sbomify.com/CVE-2026-27161/): Unauthenticated Information Disclosure via .htaccess Reliance in Sensitive Directories (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27147 and fix it if it is affected.

What it is: CVE-2026-27147 is a medium-severity cross-site scripting vulnerability in GetSimpleCMS-CE, published on 20 Feb 2026. Any signed-in user can exploit it over the network, 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-2026-27147 exists.

Affected product: GetSimpleCMS-CE. 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-2026-27147/ (Markdown: https://insights.sbomify.com/CVE-2026-27147/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27147
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27147
- OSV: https://osv.dev/vulnerability/CVE-2026-27147

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27147/
Summaries are generated and may contain mistakes; the official description above is the record.