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CVE-2026-88005· NVD / CVE Program· CNA GitHub_M

Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange

Noroxi assessment

Priority: Monitor (action score 26/100)

  • 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: 0.37% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: open-webui open-webui 0.9.0.

Low priority for now. Upgrade to open-webui open-webui 0.9.0 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 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Sep 10, 2026
Updated
Sep 18, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
6.5
NVD has not scored this yet; the score shown is the CNA’s.

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
openwebuiopen 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 0.9.0

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, < 0.9.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
PyPIopen-webuifrom 0.8.0 · before 0.9.00.9.0

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-2026-88001Sep 9, 2026 · Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets
    20Monitor
  • ← EarlierCVE-2026-88002Sep 9, 2026 · Open WebUI: Any authenticated user can hang the server via a cyclic chat message history
    26Monitor
  • Later →CVE-2026-88006Sep 10, 2026 · Open WebUI: Users denied by the OAuth role policy can still sign in via token exchange
    26Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
open-webui open-webui0.9.0 · descriptionVendor (CNA)
PyPI:open-webui0.9.0Package 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-2026-45672118 days apartOpen WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
    35Monitor
  • CVE-2026-880060 days apartOpen WebUI: Users denied by the OAuth role policy can still sign in via token exchange
    26Monitor
  • CVE-2026-45339118 days apartOpen WebUI: API key endpoint restrictions bypassed via `x-api-key` header — full message processing on restricted endpoints
    26Monitor
  • CVE-2026-7049037 days apartOpen WebUI: Unapproved accounts can open terminal sessions via a WebSocket auth path missing the role check
    25Monitor
  • CVE-2026-5402179 days apartOpen WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter
    25Monitor
  • CVE-2026-5921263 days apartOpen WebUI: Model meta.knowledge read-only file access can be upgraded to file write/delete
    21Monitor

Chain candidates

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

—

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.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

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

nvd-secondary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records