CVE-2026-12766 Server-side request forgery in Langflow OSS
An authenticated attacker can exploit missing URL validation in Langflow to perform server-side request forgery, enabling network enumeration and facilitating further attacks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12766?
CVE-2026-12766 is a medium-severity server-side request forgery vulnerability in IBM Langflow OSS, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM Langflow OSS 1.0.0 through 1.11.2 is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other attacks.
Weakness: CWE-918
Which versions are affected by CVE-2026-12766?
How do I fix CVE-2026-12766?
No fix has been published for CVE-2026-12766 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-2026-12766 being exploited?
There is no known exploitation of CVE-2026-12766 in the wild and no public exploit code.
Sources
Also known as GHSA-w3gg-r3w4-786c.