Vulnerability-Lookup

CVE-2026-70488 (GCVE-0-2026-70488)

Vulnerability from cvelistv5 – Published: 2026-08-04 20:35 – Updated: 2026-08-05 14:02

Title

Open WebUI: Deletion of directories and file embeddings in other knowledge bases via sync cleanup

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the sync cleanup endpoint authorized write access to the knowledge base in the URL but then acted on directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base. A user with write access to one knowledge base could delete directories and remove file embeddings from another knowledge base, causing documents to drop out of retrieval results and breaking chat-with-file for targeted documents without disclosing contents. This issue is fixed in 0.11.0.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key
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/26722	x_refsource_MISC
https://github.com/open-webui/open-webui/commit/7…	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: >= 0.9.6, < 0.11.0

Show details on NVD website

JSON

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GHSA-JXC9-XMC4-GR23

Vulnerability from github – Published: 2026-08-04 20:35 – Updated: 2026-08-04 20:35

Summary

Open WebUI: Deletion of directories and file embeddings in other knowledge bases via sync cleanup

Details

Summary

A user with write access to one knowledge base could delete directories, and drop file embeddings, belonging to knowledge bases they do not control. The sync cleanup endpoint verified write access on the knowledge base named in the URL and then acted on the directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base.

Preconditions

Default configuration, no flags involved. The attacker needs write access to at least one knowledge base, which comes from owning one, from a write access grant, or from the admin role; workspace.knowledge is off by default, so an ordinary user cannot simply create one. They also need the victim's directory or file id, which are UUIDs and are not enumerable, so in practice the attacker is someone who can already see the target knowledge base, typically a read-only collaborator on a shared one. Deployments where no knowledge base is shared beyond its owner are not reachable.

Impact

The attacker deletes a target directory and, because the deletion runs without moving files to the parent, the knowledge_file associations for every file in that subtree are removed as well, so those documents silently drop out of the victim's knowledge base and out of its retrieval results. Separately, the per-file vector cleanup dropped the standalone file-<id> collection for any file id, breaking chat-with-file for that document. The stored files and their database rows survive, since that path was gated on file ownership, and an owner can restore the state by re-adding and reprocessing. Nothing about the target knowledge base's contents is disclosed to the attacker.

Fix

Fixed in https://github.com/open-webui/open-webui/pull/26722. Both request-body loops are now scoped to the knowledge base in the URL: a directory is resolved and skipped unless its knowledge_id matches, and the per-file vector cleanup runs only for files that are members of that knowledge base. Upgrading fully resolves the issue.

Root cause

Affected component: backend/open_webui/routers/knowledge.py, handler sync_knowledge_cleanup, endpoint POST /api/v1/knowledge/{id}/sync/cleanup. Affected setup: all builds from 0.9.6 onward, no optional dependency involved.

The handler treated the write-access check on the URL knowledge base as authorization for everything it went on to do, but the objects it acted on came from the request body and were addressed by primary key alone. Directory deletion at the model layer deletes by directory id and has no notion of a parent knowledge base, so the only thing that could have bound the two together was a membership check in the handler, and there was none. The explicit directory-delete endpoint in the same router already carried that check, which is what makes this a gap in one handler rather than a missing model-layer control.

Credits

Reported by @whyiug.

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.10.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.6"
            },
            {
              "fixed": "0.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70488"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T20:35:47Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\nA user with write access to one knowledge base could delete directories, and drop file embeddings, belonging to knowledge bases they do not control. The sync cleanup endpoint verified write access on the knowledge base named in the URL and then acted on the directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base.\n\n## Preconditions\nDefault configuration, no flags involved. The attacker needs write access to at least one knowledge base, which comes from owning one, from a write access grant, or from the admin role; `workspace.knowledge` is off by default, so an ordinary user cannot simply create one. They also need the victim\u0027s directory or file id, which are UUIDs and are not enumerable, so in practice the attacker is someone who can already see the target knowledge base, typically a read-only collaborator on a shared one. Deployments where no knowledge base is shared beyond its owner are not reachable.\n\n## Impact\nThe attacker deletes a target directory and, because the deletion runs without moving files to the parent, the knowledge_file associations for every file in that subtree are removed as well, so those documents silently drop out of the victim\u0027s knowledge base and out of its retrieval results. Separately, the per-file vector cleanup dropped the standalone `file-\u003cid\u003e` collection for any file id, breaking chat-with-file for that document. The stored files and their database rows survive, since that path was gated on file ownership, and an owner can restore the state by re-adding and reprocessing. Nothing about the target knowledge base\u0027s contents is disclosed to the attacker.\n\n## Fix\nFixed in https://github.com/open-webui/open-webui/pull/26722. Both request-body loops are now scoped to the knowledge base in the URL: a directory is resolved and skipped unless its `knowledge_id` matches, and the per-file vector cleanup runs only for files that are members of that knowledge base. Upgrading fully resolves the issue.\n\n## Root cause\nAffected component: `backend/open_webui/routers/knowledge.py`, handler `sync_knowledge_cleanup`, endpoint `POST /api/v1/knowledge/{id}/sync/cleanup`. Affected setup: all builds from 0.9.6 onward, no optional dependency involved.\n\nThe handler treated the write-access check on the URL knowledge base as authorization for everything it went on to do, but the objects it acted on came from the request body and were addressed by primary key alone. Directory deletion at the model layer deletes by directory id and has no notion of a parent knowledge base, so the only thing that could have bound the two together was a membership check in the handler, and there was none. The explicit directory-delete endpoint in the same router already carried that check, which is what makes this a gap in one handler rather than a missing model-layer control.\n\n## Credits\nReported by @whyiug.",
  "id": "GHSA-jxc9-xmc4-gr23",
  "modified": "2026-08-04T20:35:47Z",
  "published": "2026-08-04T20:35:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-jxc9-xmc4-gr23"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/pull/26722"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/707efeaed7992dd9896d5928559458f228b9a539"
    },
    {
      "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:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Deletion of directories and file embeddings in other knowledge bases via sync cleanup"
}

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-2026-70488 (GCVE-0-2026-70488)

GHSA-JXC9-XMC4-GR23

Summary

Preconditions

Impact

Fix

Root cause

Credits

Tags

Sightings

Nomenclature