CVE-2025-5699 Developer Formatter <= 2015.0.2.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via Custom CSS
Administrators can inject arbitrary scripts via Custom CSS in Developer Formatter, affecting multi-site or restricted HTML installations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-5699?
CVE-2025-5699 is a medium-severity cross-site scripting vulnerability in gsaraiva Developer Formatter, published on 6 Jun 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Developer Formatter plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Custom CSS in all versions up to, and including, 2015.0.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Weakness: CWE-79
Which versions are affected by CVE-2025-5699?
How do I fix CVE-2025-5699?
No fix has been published for CVE-2025-5699 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-2025-5699 being exploited?
There is no known exploitation of CVE-2025-5699 in the wild and no public exploit code.
Sources
Also known as GHSA-hqf5-h939-qcr6.