Vulnerability-Lookup

CVE-2026-87013 (GCVE-0-2026-87013)

Vulnerability from cvelistv5 – Published: 2026-09-09 21:00 – Updated: 2026-09-10 15:40

Title

Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/v1/folders/{id}/update/parent allowed a user to place a folder under itself or one of its descendants, while the folder tree walks used by DELETE /api/v1/folders/{id} and POST /api/v1/folders/{id}/read did not track visited folder identifiers. An authenticated user could persist a parent cycle and start a request that consumed CPU and memory indefinitely, with the condition remaining stored until repaired. This issue is fixed in version 0.11.1.

Severity

4.3 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 15:40 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/open-webui/open-webui/security…	x_refsource_CONFIRM
https://github.com/open-webui/open-webui/pull/28748	x_refsource_MISC
https://github.com/open-webui/open-webui/commit/2…	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: >= 0.10.0, < 0.11.1	guessed

Show details on NVD website

JSON

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FKIE_CVE-2026-87013

Vulnerability from fkie_nvd - Published: 2026-09-09 21:17 - Updated: 2026-09-15 16:09

Severity

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

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/open-webui/open-webui/commit/23b3a69bc26839bfa74edd1be6bfa2568ae902f4	Patch
security-advisories@github.com	https://github.com/open-webui/open-webui/pull/28748	Issue Tracking, Patch
security-advisories@github.com	https://github.com/open-webui/open-webui/releases/tag/v0.11.1	Release Notes
security-advisories@github.com	https://github.com/open-webui/open-webui/security/advisories/GHSA-8r35-5x5r-hv74	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/open-webui/open-webui/security/advisories/GHSA-8r35-5x5r-hv74	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	openwebui	open_webui	*

JSON

To clipboard

{
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          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
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GHSA-8R35-5X5R-HV74

Vulnerability from github – Published: 2026-09-10 22:42 – Updated: 2026-09-10 22:42

Summary

Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle

Details

Summary

Any authenticated user can move one of their own folders under itself, leaving a loop in their folder tree. The re-parent endpoint performed no check that the new parent was not the folder itself or one of its own subfolders, and the folder tree walks did not track which folders they had already visited. A single request against a folder in a loop therefore never finishes.

Preconditions

Folders must be enabled (ENABLE_FOLDERS, default true) and the acting user's role must hold the folders feature permission (USER_PERMISSIONS_FEATURES_FOLDERS, default true). Both are on in a default install. Any authenticated account is sufficient: no administrator, no second user, no shared folder and no victim interaction. Deployments that disable folders, or withhold the folders feature permission from non-admin roles, are not affected.

Impact

A single request that never returns. It keeps running after the client disconnects, holds a CPU core and grows its in-memory folder list at roughly 0.6 GB per hour until the process is restarted. The folder stays in the looping state in the database, so any later request touching that folder starts the loop again.

The instance stays responsive while this happens. Each step of the walk waits on a database query, so other users continue to be served normally; measured on a default install, two concurrent instances of this request left unrelated users unaffected, and roughly 900 concurrent requests were needed before anyone else saw a slowdown. Nothing is denied to any other party at the time of the attack, and an unattended instance degrades over hours rather than immediately. No user data is exposed and no data belonging to another user is modified.

Fix

Fixed in 0.11.1 by https://github.com/open-webui/open-webui/pull/28748. Moving a folder into itself or into one of its own subfolders is now rejected with a 400, every folder tree walk skips ids it has already visited, and a folder whose parent chain loops is returned to the root the next time the folder list is requested. An instance that already holds folders in this state recovers on upgrade with no operator action.

Root cause

Affected components: the folder re-parent handler POST /api/v1/folders/{id}/update/parent, the subtree walk in the folder model that expands a folder into its descendants, and the two endpoints that call it, DELETE /api/v1/folders/{id} and POST /api/v1/folders/{id}/read. Affected setup: the subtree walk was introduced in 0.10.0, so no earlier release carries the code.

The folder hierarchy is stored as a plain parent reference per folder, with the acyclic property assumed rather than enforced. The write path never validated that assumption, and the read paths were written as if it always held, so nothing on either side would notice or stop a loop.

Proof of concept

Reproduced against a default 0.11.0 install. As an ordinary authenticated user:

Create a folder and note its id.
POST /api/v1/folders/{id}/update/parent with parent_id set to that same id. The request is accepted.
DELETE /api/v1/folders/{id} (or POST /api/v1/folders/{id}/read). The request never returns, and the worker continues running after the client disconnects.

No data was seeded directly into the database. Every step ran through the public API.

Credits

@luida-ikura, who reported the folder parent cycle and the non-terminating subtree walk it reaches.

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

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  "affected": [
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      },
      "package": {
        "ecosystem": "PyPI",
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        {
          "events": [
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-87013"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T22:42:25Z",
    "nvd_published_at": "2026-09-09T21:17:06Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\nAny authenticated user can move one of their own folders under itself, leaving a loop in their folder tree. The re-parent endpoint performed no check that the new parent was not the folder itself or one of its own subfolders, and the folder tree walks did not track which folders they had already visited. A single request against a folder in a loop therefore never finishes.\n\n## Preconditions\nFolders must be enabled (`ENABLE_FOLDERS`, default true) and the acting user\u0027s role must hold the folders feature permission (`USER_PERMISSIONS_FEATURES_FOLDERS`, default true). Both are on in a default install. Any authenticated account is sufficient: no administrator, no second user, no shared folder and no victim interaction. Deployments that disable folders, or withhold the folders feature permission from non-admin roles, are not affected.\n\n## Impact\nA single request that never returns. It keeps running after the client disconnects, holds a CPU core and grows its in-memory folder list at roughly 0.6 GB per hour until the process is restarted. The folder stays in the looping state in the database, so any later request touching that folder starts the loop again.\n\nThe instance stays responsive while this happens. Each step of the walk waits on a database query, so other users continue to be served normally; measured on a default install, two concurrent instances of this request left unrelated users unaffected, and roughly 900 concurrent requests were needed before anyone else saw a slowdown. Nothing is denied to any other party at the time of the attack, and an unattended instance degrades over hours rather than immediately. No user data is exposed and no data belonging to another user is modified.\n\n## Fix\nFixed in 0.11.1 by https://github.com/open-webui/open-webui/pull/28748. Moving a folder into itself or into one of its own subfolders is now rejected with a 400, every folder tree walk skips ids it has already visited, and a folder whose parent chain loops is returned to the root the next time the folder list is requested. An instance that already holds folders in this state recovers on upgrade with no operator action.\n\n## Root cause\nAffected components: the folder re-parent handler `POST /api/v1/folders/{id}/update/parent`, the subtree walk in the folder model that expands a folder into its descendants, and the two endpoints that call it, `DELETE /api/v1/folders/{id}` and `POST /api/v1/folders/{id}/read`. Affected setup: the subtree walk was introduced in 0.10.0, so no earlier release carries the code.\n\nThe folder hierarchy is stored as a plain parent reference per folder, with the acyclic property assumed rather than enforced. The write path never validated that assumption, and the read paths were written as if it always held, so nothing on either side would notice or stop a loop.\n\n## Proof of concept\nReproduced against a default 0.11.0 install. As an ordinary authenticated user:\n\n1. Create a folder and note its id.\n2. `POST /api/v1/folders/{id}/update/parent` with `parent_id` set to that same id. The request is accepted.\n3. `DELETE /api/v1/folders/{id}` (or `POST /api/v1/folders/{id}/read`). The request never returns, and the worker continues running after the client disconnects.\n\nNo data was seeded directly into the database. Every step ran through the public API.\n\n## Credits\n@luida-ikura, who reported the folder parent cycle and the non-terminating subtree walk it reaches.",
  "id": "GHSA-8r35-5x5r-hv74",
  "modified": "2026-09-10T22:42:25Z",
  "published": "2026-09-10T22:42:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-8r35-5x5r-hv74"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87013"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/pull/28748"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/23b3a69bc26839bfa74edd1be6bfa2568ae902f4"
    },
    {
      "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:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle"
}

Sightings

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Detection rules are retrieved from Rulezet.

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Action not permitted

CVE-2026-87013 (GCVE-0-2026-87013)

FKIE_CVE-2026-87013

GHSA-8R35-5X5R-HV74

Summary

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Impact

Fix

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Proof of concept

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