Vulnerability-Lookup

CVE-2026-70484 (GCVE-0-2026-70484)

Vulnerability from cvelistv5 – Published: 2026-08-04 19:56 – Updated: 2026-08-05 14:48

Title

Open WebUI: Users denied the image-generation permission can still generate images via chat completions

Summary

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.7.0 until 0.11.0, the legacy chat-completions features block trusted a client-supplied image_generation flag and did not re-check the features.image_generation permission that the direct image routes and native function-calling path enforce. An authenticated user whose image-generation permission had been revoked could still consume the operator's configured image provider through chat completions, spending API credits and provider quota and writing generated files to operator storage, without exposing provider credentials or other users' data. 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:N/A:L

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/26703	x_refsource_MISC
https://github.com/open-webui/open-webui/commit/8…	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: >= 0.7.0, < 0.11.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-70484

Vulnerability from fkie_nvd - Published: 2026-08-04 20:16 - Updated: 2026-08-04 20:16

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/897d69a35c65f8ab54583bb9ca8dc74eab7bcd29
	security-advisories@github.com	https://github.com/open-webui/open-webui/pull/26703
	security-advisories@github.com	https://github.com/open-webui/open-webui/releases/tag/v0.11.0
	security-advisories@github.com	https://github.com/open-webui/open-webui/security/advisories/GHSA-g423-grf7-98rv

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "open-webui",
          "vendor": "open-webui",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.7.0, \u003c 0.11.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.7.0 until 0.11.0, the legacy chat-completions features block trusted a client-supplied image_generation flag and did not re-check the features.image_generation permission that the direct image routes and native function-calling path enforce. An authenticated user whose image-generation permission had been revoked could still consume the operator\u0027s configured image provider through chat completions, spending API credits and provider quota and writing generated files to operator storage, without exposing provider credentials or other users\u0027 data. This issue is fixed in 0.11.0."
    }
  ],
  "id": "CVE-2026-70484",
  "lastModified": "2026-08-04T20:16:55.477",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-04T20:16:55.477",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-webui/open-webui/commit/897d69a35c65f8ab54583bb9ca8dc74eab7bcd29"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-webui/open-webui/pull/26703"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-webui/open-webui/releases/tag/v0.11.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-g423-grf7-98rv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-G423-GRF7-98RV

Vulnerability from github – Published: 2026-08-04 19:56 – Updated: 2026-08-04 19:56

Summary

Open WebUI: Users denied the image-generation permission can still generate images via chat completions

Details

Summary

An authenticated user whose features.image_generation permission has been revoked can still make the server generate images by sending the feature flag in a chat-completion request. The chat pipeline took the client-supplied features object at face value and never re-checked the permission that the direct image routes enforce, so the denial applied to the UI affordance but not to the server-side generation path.

Preconditions

Image generation must be enabled and a provider configured by the administrator (ENABLE_IMAGE_GENERATION is off by default). The per-user permission defaults to granted, so only deployments where an administrator explicitly revoked it for some users are affected. On 0.10.0 and later the caller must also set params.function_calling to legacy; on 0.9.x and earlier the legacy mode was the default, so no special parameter was needed. Deployments on native function calling are unaffected, since that path checks the permission before registering the image tools.

Impact

A user the administrator has explicitly denied image generation can consume the operator's configured provider through the chat API, spending the operator's API credits and provider quota and writing generated files to the operator's storage. Where an image is present in the conversation and image editing is enabled, the same handler reaches the image-edit provider as well. No provider credentials are exposed, and no other user's data is reachable.

Fix

Fixed in 897d69a (#26703). The legacy chat-features block now re-checks features.image_generation against the caller's permissions before invoking the image handler, matching the check the direct image routes and the native function-calling path already performed.

Root cause

The chat-completions endpoint stored the request's features object into request metadata, and process_chat_payload in the chat middleware dispatched to the image handler purely on the truthiness of that client-supplied flag. Permission enforcement lived on the two surfaces that were reached from the UI, the direct /images/generations and /images/edit routes and the native function-calling tool registration, and was simply absent on the legacy chat path. The flag was treated as a statement of user intent, which it is, rather than as an authorization decision, which the handler behind it made it.

Credits

@DavidCarliez, for identifying that the chat pipeline honours the client-supplied image-generation feature flag without re-checking the permission.

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "open-webui"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.7.0"
            },
            {
              "fixed": "0.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-70484"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T19:56:57Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\nAn authenticated user whose `features.image_generation` permission has been revoked can still make the server generate images by sending the feature flag in a chat-completion request. The chat pipeline took the client-supplied `features` object at face value and never re-checked the permission that the direct image routes enforce, so the denial applied to the UI affordance but not to the server-side generation path.\n\n## Preconditions\nImage generation must be enabled and a provider configured by the administrator (`ENABLE_IMAGE_GENERATION` is off by default). The per-user permission defaults to granted, so only deployments where an administrator explicitly revoked it for some users are affected. On 0.10.0 and later the caller must also set `params.function_calling` to `legacy`; on 0.9.x and earlier the legacy mode was the default, so no special parameter was needed. Deployments on native function calling are unaffected, since that path checks the permission before registering the image tools.\n\n## Impact\nA user the administrator has explicitly denied image generation can consume the operator\u0027s configured provider through the chat API, spending the operator\u0027s API credits and provider quota and writing generated files to the operator\u0027s storage. Where an image is present in the conversation and image editing is enabled, the same handler reaches the image-edit provider as well. No provider credentials are exposed, and no other user\u0027s data is reachable.\n\n## Fix\nFixed in 897d69a (#26703). The legacy chat-features block now re-checks `features.image_generation` against the caller\u0027s permissions before invoking the image handler, matching the check the direct image routes and the native function-calling path already performed.\n\n## Root cause\nThe chat-completions endpoint stored the request\u0027s `features` object into request metadata, and `process_chat_payload` in the chat middleware dispatched to the image handler purely on the truthiness of that client-supplied flag. Permission enforcement lived on the two surfaces that were reached from the UI, the direct `/images/generations` and `/images/edit` routes and the native function-calling tool registration, and was simply absent on the legacy chat path. The flag was treated as a statement of user intent, which it is, rather than as an authorization decision, which the handler behind it made it.\n\n## Credits\n@DavidCarliez, for identifying that the chat pipeline honours the client-supplied image-generation feature flag without re-checking the permission.",
  "id": "GHSA-g423-grf7-98rv",
  "modified": "2026-08-04T19:56:57Z",
  "published": "2026-08-04T19:56:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-g423-grf7-98rv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/pull/26703"
    },
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/commit/897d69a35c65f8ab54583bb9ca8dc74eab7bcd29"
    },
    {
      "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:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: Users denied the image-generation permission can still generate images via chat completions"
}

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.

Action not permitted

CVE-2026-70484 (GCVE-0-2026-70484)

FKIE_CVE-2026-70484

GHSA-G423-GRF7-98RV

Summary

Preconditions

Impact

Fix

Root cause

Credits

Tags

Sightings

Nomenclature