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CVE-2026-54020

Open WebUI: DNS Rebinding SSRF Bypass

Published: Aug 4, 2026Updated: Aug 5, 2026 Sources: CVE List NVDCWE-367
6.3MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 88.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated attacker who controlled authoritative DNS for a submitted hostname could answer with a public address during validation and an internal one during connection, reaching cloud metadata, loopback admin APIs, or internal services through URL ingest, chat image_url fetches, image editing, or OAuth profile-picture fetches, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. This issue is fixed in 0.11.0.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-367CWE-918

Affected Products

open-webui
oss-projectaka open-webui/open-webui
open-webuiOn-premWeb App
AI / ML / ai-agent-tooling

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/open-webui/open-webui/releases/tag/v0.11.0
github.com
https://github.com/open-webui/open-webui/security/advisories/GHSA-h6x2-583h-x99r
github.com

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