Vulnerability-Lookup

CVE-2026-88006 (GCVE-0-2026-88006)

Vulnerability from cvelistv5 – Published: 2026-09-10 14:43 – Updated: 2026-09-10 17:46

Title

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

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.1, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without running the OAuth role management that the normal OAuth login callback runs. A user whose provider roles the login callback would refuse, or would demote, could still obtain a working session at their existing role through this endpoint. This issue is fixed in version 0.11.1.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 17:45 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/open-webui/open-webui/security…	x_refsource_CONFIRM
https://github.com/open-webui/open-webui/commit/d…	x_refsource_MISC
https://github.com/open-webui/open-webui/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
open-webui	open-webui	Affected: >= 0.8.0, < 0.11.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-88006

Vulnerability from fkie_nvd - Published: 2026-09-10 15:17 - Updated: 2026-09-10 19:54

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/open-webui/open-webui/commit/d799e81edbdc971c6deb096b6474cd95b93504bf
	security-advisories@github.com	https://github.com/open-webui/open-webui/releases/tag/v0.11.1
	security-advisories@github.com	https://github.com/open-webui/open-webui/security/advisories/GHSA-wvm9-9g5j-623f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.8.0, \u003c 0.11.1"
            }
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    }
  ],
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  "lastModified": "2026-09-10T19:54:25.810",
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GHSA-WVM9-9G5J-623F

Vulnerability from github – Published: 2026-09-10 23:04 – Updated: 2026-09-10 23:04

Summary

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

Details

Summary

Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without running the OAuth role management that the normal OAuth login callback runs. A user whose provider roles the login callback would refuse, or would demote, could still obtain a working session at their existing role through this endpoint.

Preconditions

ENABLE_OAUTH_TOKEN_EXCHANGE=True. It is disabled by default, so a default deployment is not affected.
ENABLE_OAUTH_ROLE_MANAGEMENT=True together with OAUTH_ALLOWED_ROLES or OAUTH_ADMIN_ROLES. Role management is off by default, and deployments not using it are not affected.
A valid, unexpired access token on the configured provider.
An Open WebUI account already linked to that provider subject, or an account with a matching email when OAUTH_MERGE_ACCOUNTS_BY_EMAIL is enabled. This endpoint never creates accounts, so a token for a subject with no existing account is rejected.

Impact

An admin who relies on OAuth role management expects a user to lose access, or lose admin, as soon as the identity provider stops reporting the required role. The login callback does enforce this on the next sign-in. Token exchange kept issuing sessions and never re-evaluated the role, so the user retained working access as their existing account at its existing role, including an admin role the provider had already revoked. The endpoint cannot create an account and cannot raise anyone's role, so this grants continued access rather than new or elevated access.

Fix

d799e81ed, released in 0.11.1, runs the same role evaluation on the provider's response that the login callback runs. The exchange is denied with 403 when the reported roles match no allowed or admin role, and the account's role is updated to match the provider otherwise. Upgrading restores the check with no further action.

Root cause

The affected component is the OAuth token exchange endpoint in backend/open_webui/routers/auths.py, present in builds from 0.8.0 onward.

The endpoint was added as a second entry point into the same session-issuing path the OAuth login callback uses, but it re-implemented only the identity lookup and not the policy checks surrounding it. Role evaluation lived inside the callback's own body rather than in shared code, so the second caller inherited none of it.

Credits

@Classic298

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.8.0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-88006"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T23:04:57Z",
    "nvd_published_at": "2026-09-10T15:17:55Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\nOpen WebUI\u0027s OAuth token exchange endpoint issues a session for a provider access token without running the OAuth role management that the normal OAuth login callback runs. A user whose provider roles the login callback would refuse, or would demote, could still obtain a working session at their existing role through this endpoint.\n\n## Preconditions\n- `ENABLE_OAUTH_TOKEN_EXCHANGE=True`. It is disabled by default, so a default deployment is not affected.\n- `ENABLE_OAUTH_ROLE_MANAGEMENT=True` together with `OAUTH_ALLOWED_ROLES` or `OAUTH_ADMIN_ROLES`. Role management is off by default, and deployments not using it are not affected.\n- A valid, unexpired access token on the configured provider.\n- An Open WebUI account already linked to that provider subject, or an account with a matching email when `OAUTH_MERGE_ACCOUNTS_BY_EMAIL` is enabled. This endpoint never creates accounts, so a token for a subject with no existing account is rejected.\n\n## Impact\nAn admin who relies on OAuth role management expects a user to lose access, or lose admin, as soon as the identity provider stops reporting the required role. The login callback does enforce this on the next sign-in. Token exchange kept issuing sessions and never re-evaluated the role, so the user retained working access as their existing account at its existing role, including an admin role the provider had already revoked. The endpoint cannot create an account and cannot raise anyone\u0027s role, so this grants continued access rather than new or elevated access.\n\n## Fix\nd799e81ed, released in 0.11.1, runs the same role evaluation on the provider\u0027s response that the login callback runs. The exchange is denied with 403 when the reported roles match no allowed or admin role, and the account\u0027s role is updated to match the provider otherwise. Upgrading restores the check with no further action.\n\n## Root cause\nThe affected component is the OAuth token exchange endpoint in `backend/open_webui/routers/auths.py`, present in builds from 0.8.0 onward.\n\nThe endpoint was added as a second entry point into the same session-issuing path the OAuth login callback uses, but it re-implemented only the identity lookup and not the policy checks surrounding it. Role evaluation lived inside the callback\u0027s own body rather than in shared code, so the second caller inherited none of it.\n\n## Credits\n@Classic298",
  "id": "GHSA-wvm9-9g5j-623f",
  "modified": "2026-09-10T23:04:57Z",
  "published": "2026-09-10T23:04:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-wvm9-9g5j-623f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88006"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/d799e81edbdc971c6deb096b6474cd95b93504bf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-webui/open-webui"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/releases/tag/v0.11.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Users denied by the OAuth role policy can still sign in via token exchange"
}

Sightings

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Action not permitted

CVE-2026-88006 (GCVE-0-2026-88006)

FKIE_CVE-2026-88006

GHSA-WVM9-9G5J-623F

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