High severity · published Mar 26, 2026
CVE-2026-29070
Open WebUI has unauthorized deletion of knowledge files
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an access control check is missing when deleting a file from a knowledge base. The only check being done is that the user has write access to the knowledge base (or is admin), but NOT that the file actually belongs to this knowledge base. It is thus possible to delete arbitrary files from arbitrary knowledge bases (as long as one knows the file id). Version 0.8.6 patches the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
< 0.8.6 · source: vendor
OW
Open Webui · Openwebui
before 0.8.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29070
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-29070
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-26gm-93rw-cchf
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