PYSEC-2026-1381

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:24
VLAI
Details

Impact

A Cross-Site Scripting (XSS) vulnerability has been discovered on the OAuth login page. An attacker could trick a user to follow a specially crafted URL to the OAuth login page. This URL could inject and execute malicious javascript code that would get executed on the user's browser.

Impacted versions: Flask-AppBuilder version 4.1.4 up to and including 4.2.0

Patches

This issue was introduced on 4.1.4 and patched on 4.2.1, user's should upgrade to 4.2.1 or newer versions.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Impacted products
Name purl
flask-appbuilder pkg:pypi/flask-appbuilder
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-appbuilder",
        "purl": "pkg:pypi/flask-appbuilder"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.4"
            },
            {
              "fixed": "4.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.4",
        "4.1.5",
        "4.1.5rc1",
        "4.1.6",
        "4.1.6rc1",
        "4.1.7rc1",
        "4.2.0",
        "4.2.0rc1",
        "4.2.1rc1"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-27083",
    "GHSA-fqxj-46wg-9v84"
  ],
  "details": "### Impact\nA Cross-Site Scripting (XSS) vulnerability has been discovered on the OAuth login page. An attacker could trick a user to follow a specially crafted URL to the OAuth login page. This URL could inject and execute malicious javascript code that would get executed on the user\u0027s browser.\n\nImpacted versions:\nFlask-AppBuilder version 4.1.4 up to and including 4.2.0\n\n### Patches\nThis issue was introduced on 4.1.4 and patched on 4.2.1, user\u0027s should upgrade to 4.2.1 or newer versions.",
  "id": "PYSEC-2026-1381",
  "modified": "2026-07-07T17:24:09.090364Z",
  "published": "2026-07-07T11:45:33.452545Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-fqxj-46wg-9v84"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27083"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dpgaspar/Flask-AppBuilder/commit/3d17741886e4b3c384d0570de69689e4117aa812"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dpgaspar/Flask-AppBuilder"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/flask-appbuilder"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-fqxj-46wg-9v84"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flask-AppBuilder\u0027s OAuth login page subject to Cross Site Scripting (XSS)"
}



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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.