# CVE-2025-63708: Cross-site scripting in n/a

> Remote attackers can execute arbitrary JavaScript via unsanitized font family names in the webfonts API, leading to session theft and account hijacking.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** 17 Nov 2025
- **Updated:** 17 Nov 2025
- **Also known as:** GHSA-9chh-cmwc-p8fx

## What is CVE-2025-63708?

CVE-2025-63708 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 Nov 2025. 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

Cross-Site Scripting (XSS) vulnerability exists in SourceCodester AI Font Matcher (nid=18425, 2025-10-10) that allows remote attackers to execute arbitrary JavaScript in victims' browsers. The vulnerability occurs in the webfonts API handling mechanism where font family names are not properly sanitized. An attacker can intercept fetch requests to the webfonts endpoint and inject malicious JavaScript payloads through font family names, resulting in session cookie theft, account hijacking, and unauthorized actions performed on behalf of authenticated users. The vulnerability can be exploited by injecting a fetch hook that returns controlled font data containing malicious scripts.

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

## Which versions are affected by CVE-2025-63708?

It affects 1 product.


Products: Remyandrade Ai Font Matcher.

## How do I fix CVE-2025-63708?

No fix has been published for CVE-2025-63708 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-63708 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63708 exists.

Public exploit code:

- https://github.com/DylanDavis1/CVE-2025-63708 (github_poc): https://github.com/DylanDavis1/CVE-2025-63708

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-63708 and fix it if it is affected.

What it is: CVE-2025-63708 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 Nov 2025. 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-2025-63708 exists.

Affected product: n/a. 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-2025-63708/ (Markdown: https://insights.sbomify.com/CVE-2025-63708/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-63708
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-63708
- OSV: https://osv.dev/vulnerability/CVE-2025-63708

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-63708/
Summaries are generated and may contain mistakes; the official description above is the record.