Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Open WebUI versions before 0.5.13 are vulnerable to denial of service. An unauthenticated attacker can send a specially crafted markdown payload to the markdown-to-HTML conversion endpoint, which makes the server spend excessive time on the conversion and stop responding to other requests. Upgrade open-webui to version 0.5.13 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.0 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (@huntr_ai) |
- CISA KEV Not listed.
- EPSS 0.0088, the 59th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:42 UTC First seen by agentprime
- 31 Oct 2026, 14:42 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-5v9m-57mq-qc75
- OSV: GHSA-5v9m-57mq-qc75
- nvd.nist.gov/vuln/detail/CVE-2024-7983
- github.com/open-webui/open-webui
- github.com/open-webui/open-webui/blob/eff736acd2e0bbbdd0eeca4cc209b216a1f23b6a/backend/apps/webui/routers/utils.py#L49
- huntr.com/bounties/f8156ca5-1328-480f-a72b-8d3dfdad87dc
- pypi.org/project/open-webui
- github.com/advisories/GHSA-5v9m-57mq-qc75
- github.com/open-webui/open-webui/commit/2f75eef499cc5cb48deb639cebebf86c405640bd