CVE-2026-56400 (GCVE-0-2026-56400)

Vulnerability from cvelistv5 – Published: 2026-07-15 11:25 – Updated: 2026-07-15 11:25
VLAI
Title
open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
Summary
open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.
Severity
9 (Critical)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.3 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-613 - Insufficient Session Expiration
Assigner
References
Impacted products
Vendor Product Version
open-webui open-webui Affected: 0 , < 0.3.14 (semver)
Unaffected: 0.3.14 (semver)
Create a notification for this product.
Date Public
2026-05-05 00:00
Show details on NVD website
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      "problemTypes": [
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              "description": "Insufficient Session Expiration",
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      "providerMetadata": {
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  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-56400",
    "datePublished": "2026-07-15T11:25:31.421Z",
    "dateReserved": "2026-06-21T12:37:58.435Z",
    "dateUpdated": "2026-07-15T11:25:31.421Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.