CVE-2026-4528 trueleaf ApiFlow URL Validation http_proxy.service.ts validateUrlSecurity server-side request forgery
Remote attackers can exploit a server-side request forgery vulnerability in trueleaf ApiFlow's URL validation to access internal resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4528?
CVE-2026-4528 is a medium-severity server-side request forgery vulnerability in trueleaf ApiFlow, published on 21 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was determined in trueleaf ApiFlow 0.9.7. The impacted element is the function validateUrlSecurity of the file packages/server/src/service/proxy/http_proxy.service.ts of the component URL Validation Handler. This manipulation causes server-side request forgery. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized.
Weakness: CWE-918
Which versions are affected by CVE-2026-4528?
How do I fix CVE-2026-4528?
No fix has been published for CVE-2026-4528 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-2026-4528 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4528 exists.
Sources
Also known as GHSA-29mf-95fh-hwxf.