CVE-2024-7983 Denial of Service in open-webui/open-webui
An unauthenticated attacker can cause a denial of service in Open WebUI by sending a malicious markdown payload to an exposed conversion endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-7983?
CVE-2024-7983 is a high-severity denial of service vulnerability in Openwebui Open Webui, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In version 0.3.8 of open-webui, an endpoint for converting markdown to HTML is exposed without authentication. A maliciously crafted markdown payload can cause the server to spend excessive time converting it, leading to a denial of service. The server becomes unresponsive to other requests until the conversion is complete.
Weakness: CWE-770
Which versions are affected by CVE-2024-7983?
3 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | All versions to 0.3.8 | None |
open-webui PyPI | All versions to 0.3.8 | None |
open-webui PyPI | All versions | 0.5.13 |
Products include Openwebui Open Webui.
How do I fix CVE-2024-7983?
Upgrade open-webui to 0.5.13 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-7983 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-7983 exists.
Other vulnerabilities in Openwebui Open Webui
- CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass
- CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
- CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui
- CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
- CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Sources
Also known as GHSA-5v9m-57mq-qc75, PYSEC-2026-1723.