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    CVE-2021-29621

    Flask-AppBuilder is a development framework, built on top of Flask. User enumeration in database authentication in Flask-AppBuilder <= 3.2.3. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Upgrade to version 3.3.0 or higher to resolve.

    Published:Jun 7, 2021
    Last Modified:Mar 7, 2025
    EPS:Jun 7, 2021
    EPSS Score:0.0029
    CVSS Score:5.3

    Affected Products

    Vendor
    Apache
    Product
    Airflow
    Vendor
    Dpgaspar
    Product
    Flask-appbuilder

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-203 Observable Discrepancy

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-189 Black Box Reverse Engineering

    Related CVEs

    CVE-2026-59244 (CVSS 6.5) — Apache Airflow's secrets masker did not mask `var.json` Variable values whose value is a dict in the Rendered …
    CVE-2026-58076 (CVSS 8.8) — Apache Airflow's serialization layer reconstructed exception nodes by calling `import_string()` on a class nam…
    CVE-2026-59242 (CVSS 5.4) — Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal …
    CVE-2026-54183 (CVSS 4.3) — Apache Airflow's secrets masker hides values stored under sensitive key names when they are displayed in the U…
    CVE-2026-67260 (CVSS 7.3) — Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swe…
    CVE-2026-67587 (CVSS 8.8) — Apache Airflow's Task SDK rebuilt a `Callback` object from serialized data by re-running its constructor, whic…
    CVE-2026-65017 (CVSS 6.5) — Apache Airflow's Config API did not mask team-scoped sensitive configuration values in multi-team deployments.…
    CVE-2026-68968 (CVSS 7.5) — Apache Airflow's Backfill API authorized a request against a Dag id supplied by the caller whenever the `backf…
    CVE-2026-68969 (CVSS 6.5) — Apache Airflow wrote Variable values and Connection `extra` contents to the audit log in cleartext when they w…
    CVE-2026-68970 (CVSS 6.5) — Apache Airflow's Task SDK did not mask the contents of a Variable whose JSON value is a list, so secrets store…

    References

    https://github.com/dpgaspar/Flask-AppBuilder/commit/780bd0e8fbf2d36ada52edb769477e0a4edae580
    https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-434h-p4gx-jm89
    https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/r5b754118ba4e996adf03863705d34168bffec202da5c6bdc9bf3add5%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/r91067f953906d93aaa1c69fe2b5472754019cc6bd4f1ba81349d62a0%40%3Ccommits.airflow.apache.org%3E
    https://pypi.org/project/Flask-AppBuilder/
    https://github.com/dpgaspar/Flask-AppBuilder/commit/780bd0e8fbf2d36ada52edb769477e0a4edae580
    https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-434h-p4gx-jm89
    https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/r5b754118ba4e996adf03863705d34168bffec202da5c6bdc9bf3add5%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/r91067f953906d93aaa1c69fe2b5472754019cc6bd4f1ba81349d62a0%40%3Ccommits.airflow.apache.org%3E
    https://pypi.org/project/Flask-AppBuilder/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High