pypi package report

Is flask-user safe?

1 known vulnerability, worst severity MODERATE.

// reach

0 direct dependencies

none carry a known advisory

    0 packages depend on it

    an advisory here reaches each of them

      Create a free accountfor every dependency path, dependent and what to upgrade
      // ai model usage

      No published models are known to use this package.

      cvss
      0.0
      medium

      severity out of 10

      epss
      0.00%
      medium

      chance of exploitation in 30 days, 66th percentile of all CVEs

      xyz score
      not scored

      CyberXYZ composite out of 10

      fig. 01 — GHSA-4298-89hc-6rfv, the advisory selected below

      // 1 advisories

      GHSA-4298-89hc-6rfv

      MODERATECVE-2021-23401

      This affects all versions of package Flask-User. When using the makesafeurl function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple backslashes such as /////evil.com/path or \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using autocorrectlocationheader=False.

      // cvss v3.1 vector

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

      Attack vector
      Network
      Attack complexity
      Low
      Privileges required
      None
      User interaction
      Required
      Scope
      Unchanged
      Confidentiality
      Low
      Integrity
      Low
      Availability
      None

      Checked 2026-10-23 at 18:47 UTC. The most recent advisory here was published 2021-08-09. Updated continuously from NVD, GHSA, OSV and CNA feeds.

      Think a verdict here is wrong? Tell us — we respond within 2 business days.