Vulnerability-Lookup

CVE-2026-87014 (GCVE-0-2026-87014)

Vulnerability from cvelistv5 – Published: 2026-09-09 21:01 – Updated: 2026-09-10 17:57

Title

Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' notes

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, role synchronization in backend/open_webui/routers/auths.py and backend/open_webui/utils/oauth.py updated an administrator's database role without invalidating the user record cached by backend/open_webui/socket/main.py. An administrator demoted through a trusted role header or OAuth role mapping could keep an already-open Socket.IO connection and continue reading or editing every user's collaborative notes until that connection closed. This issue is fixed in version 0.11.1.

Severity

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 17:56 UTC

CWE

CWE-613 - Insufficient Session Expiration
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/c…	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: >= 0.9.0, < 0.11.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-87014

Vulnerability from fkie_nvd - Published: 2026-09-09 21:17 - Updated: 2026-09-10 18:18

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/open-webui/open-webui/commit/ce3c175e260709f359d7e6cbb3132f0572098b95
	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-wjwr-xfp9-r66p
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/open-webui/open-webui/security/advisories/GHSA-wjwr-xfp9-r66p

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.9.0, \u003c 0.11.1"
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    }
  ],
  "id": "CVE-2026-87014",
  "lastModified": "2026-09-10T18:18:10.760",
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GHSA-WJWR-XFP9-R66P

Vulnerability from github – Published: 2026-09-10 22:41 – Updated: 2026-09-10 22:41

Summary

Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' notes

Details

Summary

A user who is demoted from admin by an identity provider keeps admin-level read and write access to every user's notes, over any Socket.IO connection that was already open when the demotion happened. Open WebUI caches the user's role on the socket at connection time, and the two SSO role-sync paths, the reverse-proxy trusted role header and OAuth role mapping, changed the role in the database without tearing that cached session down. Only the admin user-management endpoints invalidated sessions, so a demotion driven by the identity provider left the old privileges live on the socket.

Preconditions

A role-sync SSO mode has to be enabled. Either trusted-header authentication with WEBUI_AUTH_TRUSTED_ROLE_HEADER set, which is unset by default, or OAuth with role mapping enabled, which is off by default. Deployments that change roles only through the admin panel are not affected, because that path already invalidated the user's sockets.

The account has to be an admin at the moment it opens a Socket.IO connection, has to keep that connection open across the demotion, and has to be demoted through the SSO path rather than through the admin panel. Signing out, reloading the page, or any network interruption ends the exposure, because the reconnect reads a fresh role from the database.

Impact

Until the socket closes, the demoted account can open and edit any user's note through the collaborative-notes socket handlers, which grant admins access to every note. That is read and write access to other users' private notes, held by someone the operator has already removed from the admin role.

The rest of the product is not affected. Every HTTP endpoint reads the role fresh from the database on each request, so the demoted account has no admin access to the REST API, no user management, no settings and no model or connection configuration. The exposure ends the moment the connection drops, and the account controls that only by keeping the browser tab open.

The realistic case is off-boarding or a least-privilege downgrade performed in the identity provider, which is a normal administrative action rather than a misconfiguration.

Fix

Fixed in 0.11.1 by commit ce3c175e260709f359d7e6cbb3132f0572098b95. Role changes and user deletions now publish an internal event, and a session handler tears down that user's Socket.IO connections whenever the event fires, so every path that can change a role invalidates cached sessions instead of only the admin endpoints. Upgrading is sufficient, no configuration change is needed.

Root cause

Affected components:

backend/open_webui/routers/auths.py, the trusted-header role sync in the sign-in handler.
backend/open_webui/utils/oauth.py, the OAuth role sync run on login.
backend/open_webui/socket/main.py, which caches the user record on the socket and authorizes the collaborative-notes handlers against that cached copy.

Session invalidation on role change was added as an explicit call, made at the call sites that changed a role rather than inside the role-change itself. The admin user-management endpoints made that call, the two SSO sync paths did not, and nothing else refreshed the role cached on an open socket. The socket keep-alive rewrites the cached record to reset the idle timer and preserves the stale role while doing so, so a connection that stays active is never reaped. Because the notes handlers grant full access to any note when the cached role reads admin, the gap turned into read and write access over all notes for as long as the connection lived.

Proof of concept

Deploy Open WebUI with trusted-header authentication and WEBUI_AUTH_TRUSTED_ROLE_HEADER set, or with OAuth role mapping enabled. Sign in as an admin and leave the browser open on a page holding a Socket.IO connection. Demote the account through the identity provider, meaning the next sign-in carries the role header set to user, or the account's group is changed at the OAuth provider. The database role is now user.

Over the connection that is still open, join and edit another user's note by its id. Both are granted, because the role cached on that socket still reads admin. Performing the same demotion through the admin panel instead drops the connection and revokes the access, which is the behaviour the SSO paths were missing.

This was established by source inspection against 0.11.0 rather than by an executed exploit.

Credits

Reported by @mtholmquist.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-87014"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-613",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T22:41:34Z",
    "nvd_published_at": "2026-09-09T21:17:06Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nA user who is demoted from admin by an identity provider keeps admin-level read and write access to every user\u0027s notes, over any Socket.IO connection that was already open when the demotion happened. Open WebUI caches the user\u0027s role on the socket at connection time, and the two SSO role-sync paths, the reverse-proxy trusted role header and OAuth role mapping, changed the role in the database without tearing that cached session down. Only the admin user-management endpoints invalidated sessions, so a demotion driven by the identity provider left the old privileges live on the socket.\n\n## Preconditions\n\nA role-sync SSO mode has to be enabled. Either trusted-header authentication with `WEBUI_AUTH_TRUSTED_ROLE_HEADER` set, which is unset by default, or OAuth with role mapping enabled, which is off by default. Deployments that change roles only through the admin panel are not affected, because that path already invalidated the user\u0027s sockets.\n\nThe account has to be an admin at the moment it opens a Socket.IO connection, has to keep that connection open across the demotion, and has to be demoted through the SSO path rather than through the admin panel. Signing out, reloading the page, or any network interruption ends the exposure, because the reconnect reads a fresh role from the database.\n\n## Impact\n\nUntil the socket closes, the demoted account can open and edit any user\u0027s note through the collaborative-notes socket handlers, which grant admins access to every note. That is read and write access to other users\u0027 private notes, held by someone the operator has already removed from the admin role.\n\nThe rest of the product is not affected. Every HTTP endpoint reads the role fresh from the database on each request, so the demoted account has no admin access to the REST API, no user management, no settings and no model or connection configuration. The exposure ends the moment the connection drops, and the account controls that only by keeping the browser tab open.\n\nThe realistic case is off-boarding or a least-privilege downgrade performed in the identity provider, which is a normal administrative action rather than a misconfiguration.\n\n## Fix\n\nFixed in 0.11.1 by commit `ce3c175e260709f359d7e6cbb3132f0572098b95`. Role changes and user deletions now publish an internal event, and a session handler tears down that user\u0027s Socket.IO connections whenever the event fires, so every path that can change a role invalidates cached sessions instead of only the admin endpoints. Upgrading is sufficient, no configuration change is needed.\n\n## Root cause\n\nAffected components:\n\n- `backend/open_webui/routers/auths.py`, the trusted-header role sync in the sign-in handler.\n- `backend/open_webui/utils/oauth.py`, the OAuth role sync run on login.\n- `backend/open_webui/socket/main.py`, which caches the user record on the socket and authorizes the collaborative-notes handlers against that cached copy.\n\nSession invalidation on role change was added as an explicit call, made at the call sites that changed a role rather than inside the role-change itself. The admin user-management endpoints made that call, the two SSO sync paths did not, and nothing else refreshed the role cached on an open socket. The socket keep-alive rewrites the cached record to reset the idle timer and preserves the stale role while doing so, so a connection that stays active is never reaped. Because the notes handlers grant full access to any note when the cached role reads admin, the gap turned into read and write access over all notes for as long as the connection lived.\n\n## Proof of concept\n\nDeploy Open WebUI with trusted-header authentication and `WEBUI_AUTH_TRUSTED_ROLE_HEADER` set, or with OAuth role mapping enabled. Sign in as an admin and leave the browser open on a page holding a Socket.IO connection. Demote the account through the identity provider, meaning the next sign-in carries the role header set to `user`, or the account\u0027s group is changed at the OAuth provider. The database role is now `user`.\n\nOver the connection that is still open, join and edit another user\u0027s note by its id. Both are granted, because the role cached on that socket still reads admin. Performing the same demotion through the admin panel instead drops the connection and revokes the access, which is the behaviour the SSO paths were missing.\n\nThis was established by source inspection against 0.11.0 rather than by an executed exploit.\n\n## Credits\n\nReported by @mtholmquist.",
  "id": "GHSA-wjwr-xfp9-r66p",
  "modified": "2026-09-10T22:41:34Z",
  "published": "2026-09-10T22:41:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-wjwr-xfp9-r66p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87014"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/ce3c175e260709f359d7e6cbb3132f0572098b95"
    },
    {
      "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:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users\u0027 notes"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-87014 (GCVE-0-2026-87014)

FKIE_CVE-2026-87014

GHSA-WJWR-XFP9-R66P

Summary

Preconditions

Impact

Fix

Root cause

Proof of concept

Credits

Tags

Sightings

Nomenclature