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.
- 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
- None listed
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
Which versions are affected by CVE-2025-63708?
It affects 1 product.
Products include 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.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
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: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-9chh-cmwc-p8fx.