CVE-2026-59218

Summary

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 Software

Weaknesses

• CWE-208: CWE-208: Observable Timing Discrepancy

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

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

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