# CVE-2026-47666: Penpot: Stored XSS via custom font family name injected into a @font-face style rule

> Attackers can execute arbitrary JavaScript in victims' browsers via malicious font names, leading to session theft and unauthorized access.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A: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:** 26 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-w5hh-gj5c-5wpc

## What is CVE-2026-47666?

CVE-2026-47666 is a high-severity cross-site scripting vulnerability in penpot, published on 26 Aug 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

Penpot is an open-source design and prototyping platform. In versions up to and including 2.14.3, Penpot is vulnerable to stored cross-site scripting through custom font family names, which are interpolated into a @font-face CSS rule and injected into the page as HTML without sanitization. Because the backend accepts an arbitrary font-family string and the frontend writes the resulting style through innerHTML, a name containing markup such as a closing style tag followed by a script can break out of the style element and execute JavaScript on the Penpot origin. The attack is passive: any team member who opens a file referencing the malicious font triggers script execution simply by rendering the page, allowing theft of session cookies, actions performed as the victim, and access to their files and projects. This issue is fixed in version 2.15.3.

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

## Which versions are affected by CVE-2026-47666?


## How do I fix CVE-2026-47666?

No fix has been published for CVE-2026-47666 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-47666 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47666 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47666 and fix it if it is affected.

What it is: CVE-2026-47666 is a high-severity cross-site scripting vulnerability in penpot, published on 26 Aug 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-2026-47666 exists.

Affected product: penpot. 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-2026-47666/ (Markdown: https://insights.sbomify.com/CVE-2026-47666/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47666
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47666
- OSV: https://osv.dev/vulnerability/CVE-2026-47666

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-47666/
Summaries are generated and may contain mistakes; the official description above is the record.