Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59218Open WebUI: Account enumeration via observable login timing discrepancy

Medium 5.3

In plain English

A medium-severity security flaw in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 64.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.10.0	GHSA-7rw5-9f7q-xj36
PyPI	open-webui	0.10.0	PYSEC-2026-3594

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.10.0

Weakness: CWE-208 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-7rw5-9f7q-xj36 x_refsource_CONFIRM
https://github.com/open-webui/open-webui/pull/26385 x_refsource_MISC
https://github.com/open-webui/open-webui/commit/993e74912199c66c522f08ec81abe31d76985e39 x_refsource_MISC
https://github.com/open-webui/open-webui/releases/tag/v0.10.0 x_refsource_MISC