CVE-2026-76203 CSS sanitizer bypass in Pentestify report themes allows forced outbound requests
Authenticated users can bypass CSS sanitization to force outbound requests, disclosing victim IP addresses and User-Agent strings.
- 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
- None listed
What is CVE-2026-76203?
CVE-2026-76203 is a medium-severity server-side request forgery vulnerability in maalfer Pentestify, published on 19 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
Incorrect Behavior Order: Validate Before Canonicalize in the report theme CSS sanitizer in maalfer Pentestify 1.2.0 through 2.3.2 allows an authenticated user to force outbound HTTP requests from other users' browsers, disclosing their IP address and User-Agent, via CSS hex escapes that reconstruct the url() function and evade the sanitizer blocklist
Weakness: CWE-180
Which versions are affected by CVE-2026-76203?
How do I fix CVE-2026-76203?
No fix has been published for CVE-2026-76203 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-76203 being exploited?
There is no known exploitation of CVE-2026-76203 in the wild and no public exploit code.
Sources
Also known as GHSA-6xgw-5q2h-p29f.