Medium severity · published Jul 9, 2026
CVE-2026-59218
Open WebUI: Account enumeration via observable login timing discrepancy
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than missing-email attempts and allowing unauthenticated account enumeration. This issue is fixed in version 0.10.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
< 0.10.0 · source: vendor
OW
Open Webui · Openwebui
before 0.10.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59218
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59218
Patch
https://github.com/open-webui/open-webui/commit/993e74912199c66c522f08ec81abe31d76985e39
Issue Tracking
https://github.com/open-webui/open-webui/pull/26385
Product
https://github.com/open-webui/open-webui/releases/tag/v0.10.0
Vendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-7rw5-9f7q-xj36
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