Vulnerability-Lookup

CVE-2026-70494 (GCVE-0-2026-70494)

Vulnerability from cvelistv5 – Published: 2026-08-04 20:58 – Updated: 2026-08-05 13:59

Title

Open WebUI: A folder write-collaborator can permanently delete the owner's chats by deleting a shared subfolder

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, the DELETE /api/v1/folders/{id} handler in backend/open_webui/routers/folders.py allowed a user granted write access to a shared chat folder to permanently delete chats and messages belonging to the folder owner. The cascade following the authorization check is bound to the folder owner's id, but the subfolder check accepted any inherited write grant instead of requiring ownership or administrator status. A collaborator can destroy the owner's subtree or force-move chats out of it when delete_contents=false. This issue is fixed in 0.11.0.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-862 - Missing Authorization
CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/open-webui/open-webui/security…	x_refsource_CONFIRM
https://github.com/open-webui/open-webui/pull/27003	x_refsource_MISC
https://github.com/open-webui/open-webui/commit/9…	x_refsource_MISC
https://github.com/open-webui/open-webui/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
open-webui	open-webui	Affected: >= 0.10.0, < 0.11.0

Show details on NVD website

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GHSA-3CG5-48J3-V4GV

Vulnerability from github – Published: 2026-08-04 20:58 – Updated: 2026-08-04 20:58

Summary

Open WebUI: A folder write-collaborator can permanently delete the owner's chats by deleting a shared subfolder

Details

Summary

A user granted write access to a shared chat folder could permanently delete chats and messages belonging to the folder's owner. Deleting a folder cascades into the owner's chats and the entire subfolder subtree, and the deletion handler required only write access on subfolders instead of ownership. Root folders were restricted to the owner or an admin, subfolders were not.

Preconditions

The Folders Sharing permission (user.permissions.sharing.folders) must be enabled; it is off by default. The victim must have shared a folder with the attacker at write access. features.folders and the chat.delete permission are enabled by default and are both required. Deployments that leave folder sharing disabled are not affected, and neither are single-user instances.

Impact

Permanent, irreversible destruction of another user's chat history within and beneath a shared folder. With delete_contents=false the same request instead force-moved the owner's chats out of the folder, an unauthorized relocation rather than a deletion. The write grant on the shared root folder is inherited by every descendant, so the attacker could destroy subfolders that were never explicitly shared with them. Nothing outside the shared folder's subtree is reachable, and no data is disclosed that write access did not already expose.

Fix

Fixed in 0.11.0 by https://github.com/open-webui/open-webui/pull/27003. Folder deletion is now restricted to the folder owner or an admin for root folders and subfolders alike, replacing the previous root/subfolder split with a single check. Upgrading fully resolves the issue; no configuration change is required. Owners and admins are unaffected, and a write-collaborator can still create, rename and add to shared folders and delete subfolders they own.

Root cause

Affected component: backend/open_webui/routers/folders.py, the DELETE /api/v1/folders/{id} handler. Affected setup: any release from 0.10.0 onward that has folder sharing enabled.

The cascade that follows the authorization check is bound to the folder owner's id, not the caller's, so whoever passes the check deletes the owner's data. The check itself branched on whether the folder had a parent: root folders demanded ownership or admin, while subfolders accepted any write grant. Because write grants propagate down the folder tree, that branch handed every collaborator deletion rights over the owner's subtree, which is broader than what the sharing model grants write access.

Credits

@legobattman, who reported the issue and its remediation.

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "0.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70494"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T20:58:12Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\nA user granted write access to a shared chat folder could permanently delete chats and messages belonging to the folder\u0027s owner. Deleting a folder cascades into the owner\u0027s chats and the entire subfolder subtree, and the deletion handler required only write access on subfolders instead of ownership. Root folders were restricted to the owner or an admin, subfolders were not.\n\n## Preconditions\nThe Folders Sharing permission (`user.permissions.sharing.folders`) must be enabled; it is off by default. The victim must have shared a folder with the attacker at write access. `features.folders` and the `chat.delete` permission are enabled by default and are both required. Deployments that leave folder sharing disabled are not affected, and neither are single-user instances.\n\n## Impact\nPermanent, irreversible destruction of another user\u0027s chat history within and beneath a shared folder. With `delete_contents=false` the same request instead force-moved the owner\u0027s chats out of the folder, an unauthorized relocation rather than a deletion. The write grant on the shared root folder is inherited by every descendant, so the attacker could destroy subfolders that were never explicitly shared with them. Nothing outside the shared folder\u0027s subtree is reachable, and no data is disclosed that write access did not already expose.\n\n## Fix\nFixed in 0.11.0 by https://github.com/open-webui/open-webui/pull/27003. Folder deletion is now restricted to the folder owner or an admin for root folders and subfolders alike, replacing the previous root/subfolder split with a single check. Upgrading fully resolves the issue; no configuration change is required. Owners and admins are unaffected, and a write-collaborator can still create, rename and add to shared folders and delete subfolders they own.\n\n## Root cause\nAffected component: `backend/open_webui/routers/folders.py`, the `DELETE /api/v1/folders/{id}` handler. Affected setup: any release from 0.10.0 onward that has folder sharing enabled.\n\nThe cascade that follows the authorization check is bound to the folder owner\u0027s id, not the caller\u0027s, so whoever passes the check deletes the owner\u0027s data. The check itself branched on whether the folder had a parent: root folders demanded ownership or admin, while subfolders accepted any write grant. Because write grants propagate down the folder tree, that branch handed every collaborator deletion rights over the owner\u0027s subtree, which is broader than what the sharing model grants write access.\n\n## Credits\n@legobattman, who reported the issue and its remediation.",
  "id": "GHSA-3cg5-48j3-v4gv",
  "modified": "2026-08-04T20:58:12Z",
  "published": "2026-08-04T20:58:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-3cg5-48j3-v4gv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/pull/27003"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/915ef7d0798d3175819cedbb2f62d7bf0db78c98"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-webui/open-webui"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/releases/tag/v0.11.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: A folder write-collaborator can permanently delete the owner\u0027s chats by deleting a shared subfolder"
}

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.

Action not permitted

CVE-2026-70494 (GCVE-0-2026-70494)

GHSA-3CG5-48J3-V4GV

Summary

Preconditions

Impact

Fix

Root cause

Credits

Tags

Sightings

Nomenclature