CVE-2026-59218— Open WebUI: Account enumeration via observable login timing discrepancy
Quick assessment
Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.0之前版本存在侧信道信息泄露漏洞，该漏洞源于在认证过程中使用了不安全的时间比较，使得已注册账号尝试比未注册邮箱尝试速度慢，从而允许未经身份验证的账号枚举。
Possible ATT&CK Techniques 1 AI
T1110.004 · Credential StuffingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| open-webui | open-webui | < 0.10.0 |
affected |
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I. Basic Information for CVE-2026-59218
Vulnerability Information
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Vulnerability Title
Open WebUI: Account enumeration via observable login timing discrepancy
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.10.0之前版本存在侧信道信息泄露漏洞，该漏洞源于在认证过程中使用了不安全的时间比较，使得已注册账号尝试比未注册邮箱尝试速度慢，从而允许未经身份验证的账号枚举。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | < 0.10.0 | - |
|
II. Public POCs for CVE-2026-59218
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-59218 (2)
Vendor Advisories for CVE-2026-59218 (1)
Vendor Pages for CVE-2026-59218 (1)
Same Patch Batch · open-webui · 2026-07-09 · 17 CVEs total
| CVE-2026-59224 | 8.0 HIGH | Open WebUI: Terminal proxy forwards a spoofable, integrity-unbound user identity to the up |
| CVE-2026-59216 | 7.7 HIGH | Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event |
| CVE-2026-59221 | 7.7 HIGH | open-webui terminal proxy path traversal guard bypass via 9x encoded traversal |
| CVE-2026-59214 | 7.3 HIGH | Open WebUI: Stored web worker XSS via Pyodide |
| CVE-2026-59219 | 7.1 HIGH | Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logout |
| CVE-2026-59220 | 6.5 MEDIUM | Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config |
| CVE-2026-59212 | 5.4 MEDIUM | Open WebUI: Model meta.knowledge read-only file access can be upgraded to file write/delet |
| CVE-2026-59225 | 5.4 MEDIUM | Open WebUI: Arena task endpoints can bypass underlying model access controls |
| CVE-2026-59227 | 4.3 MEDIUM | Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-use |
| CVE-2026-59217 | 4.3 MEDIUM | Open WebUI: Upload `metadata.knowledge_id` bypasses the knowledge-base write-access check |
| CVE-2026-59223 | 4.3 MEDIUM | Open WebUI: `WEB_FETCH_FILTER_LIST` host allow/block filter bypassable via URL path and no |
| CVE-2026-59213 | 3.5 LOW | Open WebUI: Cross-user model-list exposure via static cache key in get_all_models (aiocach |
| CVE-2026-59226 | 3.1 LOW | Open WebUI: Scheduled automations continue after pending-user deactivation and stored mode |
| CVE-2026-59715 | 3.1 LOW | Open WebUI: Unauthenticated WebSocket Access to Collaborative Document Handlers (ydoc:awar |
| CVE-2026-59215 | 3.1 LOW | Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_ |
| CVE-2026-59222 | Open WebUI: /api/v1/channels/{id}/members exposes full user model including sensitive cred |
IV. Related Vulnerabilities
Same product: open-webui
-
CVE-2026-88006
Open WebUI: Users denied by the OAuth role policy can still -
CVE-2026-88005
Open WebUI: Users denied by the OAuth domain allowlist or ro -
CVE-2026-88002
Open WebUI: Any authenticated user can hang the server via a -
CVE-2026-88001
Open WebUI: Server-side fetches reach blocked and internal h -
CVE-2026-88000
Open WebUI: Any authenticated user can hang the server via m
Same vendor: open-webui
-
CVE-2026-88006
Open WebUI: Users denied by the OAuth role policy can still -
CVE-2026-88005
Open WebUI: Users denied by the OAuth domain allowlist or ro -
CVE-2026-88002
Open WebUI: Any authenticated user can hang the server via a -
CVE-2026-88001
Open WebUI: Server-side fetches reach blocked and internal h -
CVE-2026-88000
Open WebUI: Any authenticated user can hang the server via m
Same weakness: CWE-208
-
CVE-2026-18040
HQC leaks private key information through secret-indexed GF( -
CVE-2026-18036
NTRU leaks private key information by reducing secret values -
CVE-2026-77696
Timing Side-Channel in SM2 Signature Generation -
CVE-2026-54875
Non-Constant-Time SM2 Scalar Multiplication on ARM64 and RIS -
CVE-2026-54872
Timing Side-Channel in Scalar Multiplication for Non-NIST EC
V. Comments for CVE-2026-59218
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