Vulnerability-Lookup

CVE-2026-87998 (GCVE-0-2026-87998)

Vulnerability from cvelistv5 – Published: 2026-09-09 21:31 – Updated: 2026-09-10 17:48

Title

Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge base could delete shared instance configuration and make every other knowledge base using that connection unavailable. This issue is fixed in version 0.11.1.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 17:28 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-863 - Incorrect Authorization

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/28113	x_refsource_MISC
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: >= 0.10.0, < 0.11.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-87998

Vulnerability from fkie_nvd - Published: 2026-09-09 22:18 - Updated: 2026-09-10 18:18

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/open-webui/open-webui/commit/dc03e7e595d61be97b25a1dd7bb99ad264f73199
	security-advisories@github.com	https://github.com/open-webui/open-webui/pull/28113
	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-2724-6cpj-gf3v

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.10.0, \u003c 0.11.1"
            }
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      ],
      "source": "security-advisories@github.com"
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  "cveTags": [],
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    }
  ],
  "id": "CVE-2026-87998",
  "lastModified": "2026-09-10T18:18:11.893",
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          "confidentialityImpact": "NONE",
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GHSA-2724-6CPJ-GF3V

Vulnerability from github – Published: 2026-09-10 15:09 – Updated: 2026-09-10 15:09

Summary

Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

Details

Summary

External knowledge connections are created and owned by administrators, and are shared by every external knowledge base bound to them. Deleting an external knowledge base also removed that connection from the instance configuration, with no check on the caller's role and no check for other knowledge bases still using it. Any authenticated user holding a write grant on a single external knowledge base could therefore wipe a shared connection that other knowledge bases depend on, and the dedicated administrator route for deleting a connection explicitly refuses that same operation while the connection is still in use.

Preconditions

The deployment uses external knowledge bases, backed by the qdrant, milvus or pgvector external providers. Instances with only local knowledge bases are not affected.

An administrator created at least one external connection and at least one external knowledge base bound to it. Both of those actions are admin-only.

The attacker is an ordinary authenticated user holding a write grant on one of those external knowledge bases. A read grant is not enough, and an unrelated user cannot reach the route at all.

The damage scales with sharing. It is worst when one connection backs several knowledge bases, because deleting a single knowledge base destroys the connection for all of them.

Impact

An ordinary user removes instance-wide configuration that only administrators can create or manage. Every other external knowledge base bound to the deleted connection keeps its stored connection id and stops working: retrieval against it fails with "External knowledge connection not found", so those knowledge bases return nothing in chat until an administrator recreates the connection by hand. The stored credential goes with it, and connection API responses strip credentials, so an administrator who did not keep the key elsewhere cannot restore the connection without obtaining it again.

Nothing is disclosed to the attacker and the external vector store itself is untouched. What is lost is Open WebUI's own connection configuration, and the availability of the knowledge bases that depend on it.

Fix

Fixed in 0.11.1 by https://github.com/open-webui/open-webui/pull/28113. Deleting an external knowledge base now clears its connection only when the caller is an administrator and the knowledge base being deleted is the last one referencing that connection, matching the dedicated connection delete route. Upgrading resolves the issue with no configuration change required.

Root cause

Affected component: the knowledge base delete handler in backend/open_webui/routers/knowledge.py, reached through DELETE /api/v1/knowledge/{id}/delete.

Affected setup: every release from 0.10.0, where external knowledge connections were introduced, up to and including 0.11.0.

The handler authorized the caller against the knowledge base, which a write grant satisfies, and then performed a second, unrelated operation against global configuration in the same request. That second step carried no authorization of its own. It neither required the administrator role that creating a connection requires, nor counted the other knowledge bases still bound to the connection. The dedicated route DELETE /api/v1/knowledge/external/connections/{id} already performed both checks, so an outcome an administrator was blocked from was reachable by a non-administrator through the knowledge base route.

Proof of concept

Reproduced against a local instance on 0.11.0 with default settings, and against 0.11.1 for comparison.

An administrator created one external connection and two external knowledge bases bound to it, then granted a plain user write access on the first knowledge base. As that user:

DELETE /api/v1/knowledge/{KB_A}/delete
Authorization: Bearer <user token>

On 0.11.0 the request returns 200 true. The administrator connection list then returns zero connections, the second knowledge base still carries the deleted connection id, and retrieving from it raises "External knowledge connection not found".

On 0.11.1 the same request deletes the knowledge base, the connection list still returns the connection, and the second knowledge base is unaffected. An administrator deleting the last remaining knowledge base on that connection still clears it, so the intended cleanup is preserved.

Credits

@Bellingham-max, for reporting the missing authorization on the shared connection teardown.

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.10.0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-87998"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-10T15:09:52Z",
    "nvd_published_at": "2026-09-09T22:18:48Z",
    "severity": "HIGH"
  },
  "details": "## Summary\nExternal knowledge connections are created and owned by administrators, and are shared by every external knowledge base bound to them. Deleting an external knowledge base also removed that connection from the instance configuration, with no check on the caller\u0027s role and no check for other knowledge bases still using it. Any authenticated user holding a write grant on a single external knowledge base could therefore wipe a shared connection that other knowledge bases depend on, and the dedicated administrator route for deleting a connection explicitly refuses that same operation while the connection is still in use.\n\n## Preconditions\nThe deployment uses external knowledge bases, backed by the qdrant, milvus or pgvector external providers. Instances with only local knowledge bases are not affected.\n\nAn administrator created at least one external connection and at least one external knowledge base bound to it. Both of those actions are admin-only.\n\nThe attacker is an ordinary authenticated user holding a write grant on one of those external knowledge bases. A read grant is not enough, and an unrelated user cannot reach the route at all.\n\nThe damage scales with sharing. It is worst when one connection backs several knowledge bases, because deleting a single knowledge base destroys the connection for all of them.\n\n## Impact\nAn ordinary user removes instance-wide configuration that only administrators can create or manage. Every other external knowledge base bound to the deleted connection keeps its stored connection id and stops working: retrieval against it fails with \"External knowledge connection not found\", so those knowledge bases return nothing in chat until an administrator recreates the connection by hand. The stored credential goes with it, and connection API responses strip credentials, so an administrator who did not keep the key elsewhere cannot restore the connection without obtaining it again.\n\nNothing is disclosed to the attacker and the external vector store itself is untouched. What is lost is Open WebUI\u0027s own connection configuration, and the availability of the knowledge bases that depend on it.\n\n## Fix\nFixed in 0.11.1 by https://github.com/open-webui/open-webui/pull/28113. Deleting an external knowledge base now clears its connection only when the caller is an administrator and the knowledge base being deleted is the last one referencing that connection, matching the dedicated connection delete route. Upgrading resolves the issue with no configuration change required.\n\n## Root cause\nAffected component: the knowledge base delete handler in backend/open_webui/routers/knowledge.py, reached through DELETE /api/v1/knowledge/{id}/delete.\n\nAffected setup: every release from 0.10.0, where external knowledge connections were introduced, up to and including 0.11.0.\n\nThe handler authorized the caller against the knowledge base, which a write grant satisfies, and then performed a second, unrelated operation against global configuration in the same request. That second step carried no authorization of its own. It neither required the administrator role that creating a connection requires, nor counted the other knowledge bases still bound to the connection. The dedicated route DELETE /api/v1/knowledge/external/connections/{id} already performed both checks, so an outcome an administrator was blocked from was reachable by a non-administrator through the knowledge base route.\n\n## Proof of concept\nReproduced against a local instance on 0.11.0 with default settings, and against 0.11.1 for comparison.\n\nAn administrator created one external connection and two external knowledge bases bound to it, then granted a plain user write access on the first knowledge base. As that user:\n\n```\nDELETE /api/v1/knowledge/{KB_A}/delete\nAuthorization: Bearer \u003cuser token\u003e\n```\n\nOn 0.11.0 the request returns 200 true. The administrator connection list then returns zero connections, the second knowledge base still carries the deleted connection id, and retrieving from it raises \"External knowledge connection not found\".\n\nOn 0.11.1 the same request deletes the knowledge base, the connection list still returns the connection, and the second knowledge base is unaffected. An administrator deleting the last remaining knowledge base on that connection still clears it, so the intended cleanup is preserved.\n\n## Credits\n@Bellingham-max, for reporting the missing authorization on the shared connection teardown.",
  "id": "GHSA-2724-6cpj-gf3v",
  "modified": "2026-09-10T15:09:52Z",
  "published": "2026-09-10T15:09:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-2724-6cpj-gf3v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87998"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/pull/28113"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/dc03e7e595d61be97b25a1dd7bb99ad264f73199"
    },
    {
      "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:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion"
}

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-2026-87998 (GCVE-0-2026-87998)

FKIE_CVE-2026-87998

GHSA-2724-6CPJ-GF3V

Summary

Preconditions

Impact

Fix

Root cause

Proof of concept

Credits

Tags

Sightings

Nomenclature