CVE-2026-70482· NVD / CVE Program· CNA GitHub_M

Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Noroxi assessment

Priority: Monitor (action score 35/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.56% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
Fixed version: open-webui open-webui 0.11.0.

Low priority for now. Upgrade to open-webui open-webui 0.11.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. This issue is fixed in 0.11.0.

HighCVSS 8.8 · v3.1—No exploit Fix available

Published: Aug 4, 2026
Updated: Sep 18, 2026
EPSS: 0.5% · 46th percentile
CWE: CWE-287

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 8.8
CNA · GitHub_M: 8.1; 0.7 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
openwebui	open webui	cpe:2.3:a:openwebui:open_webui

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

openwebui open webui0.8.0 and later · before 0.11.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

open-webui open-webui
- >= 0.8.0, < 0.11.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
PyPI	open-webui	from 0.8.0 · before 0.11.0	0.11.0

Same product

openwebui: all records

Other highest-scoring records for the same primary product.

CVE-2026-44566Open WebUI: Arbitrary File Upload and Path Traversal
39Monitor
CVE-2026-56400open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
36Monitor
CVE-2026-59216Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id
36Monitor

Published before and after this one in the same product

← EarlierCVE-2026-70480Aug 4, 2026 · Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering
16Monitor
← EarlierCVE-2026-70481Aug 4, 2026 · Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages
21Monitor
Later →CVE-2026-70483Aug 4, 2026 · Open WebUI: Any authenticated user can cancel another user's chat generation via the chat delete endpoint
17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
open-webui open-webui	0.11.0 · description	Vendor (CNA)
PyPI:open-webui	0.11.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-4455181 days apartOpen WebUI: LDAP Empty Password Authentication Bypass
36Monitor
CVE-2026-5922426 days apartOpen WebUI: Terminal proxy forwards a spoofable, integrity-unbound user identity to the upstream (X-User-Id header and ws_terminal session_id query injection)
32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2026-704790 days apartOpen WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playwright web loader
30Monitor
CVE-2026-704850 days apartOpen WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
28Monitor
CVE-2026-540200 days apartOpen WebUI: DNS Rebinding SSRF Bypass
25Monitor
CVE-2026-704800 days apartOpen WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering
16Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
A user must open a link or visit a page.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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