CVE-2026-59218: Open WebUI Account Enumeration via Timing Side-Channel

# CVE-2026-59218: Open WebUI Account Enumeration via Timing Side-Channel

https://gcdradar.vercel.app/incidents/cve-2026-59218-open-webui-account-enumeration-via-timing-sid · AIR-2026-0853 · closed 2026-07-09

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-09 (happened 2026-07-24)
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-59218
- CVSS: 5.3

## Summary

Open WebUI leaked registered account status through response-time discrepancies during sign-in attempts. The bcrypt password verification timing side-channel enabled account enumeration.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-07-24: CVE-2026-59218: Open WebUI: Account enumeration via observable login timing discrepancy (https://github.com/advisories/GHSA-7rw5-9f7q-xj36)
- 2026-07-09: CVE-2026-59218: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-59218)

## Sources

- 2026-07-09 NVD: CVE-2026-59218: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-59218
- 2026-07-24 GitHub Advisory Database: CVE-2026-59218: Open WebUI: Account enumeration via observable login timing discrepancy https://github.com/advisories/GHSA-7rw5-9f7q-xj36

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.