CVE-2022-21659
Observable Response Discrepancy in Flask-AppBuilder
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Observable Response Discrepancy in Flask-AppBuilder
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
- Record
CVE-2022-21659- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
EUVDEUVD-2022-0103
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
- Record
EUVD-2022-0103- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-wfjw-w6pv-8p7f
Observable Response Discrepancy in Flask-AppBuilder
Impact
User enumeration in database authentication in Flask-AppBuilder < 3.4.4. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in.
Patches
Upgrade to 3.4.4
Workarounds
References
For more information
If you have any questions or comments about this advisory:
- Open an issue in example link to repo
- Email us at example email address
- Record
GHSA-wfjw-w6pv-8p7f- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-203, CWE-204
- Updated
- 2026-11-02
NVD
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
- Record
CVE-2022-21659- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-203
- Updated
- 2026-11-02
OSV
Observable Response Discrepancy in Flask-AppBuilder
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
- Record
CVE-2022-21659- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-wfjw-w6pv-8p7f
Observable Response Discrepancy in Flask-AppBuilder
Impact
User enumeration in database authentication in Flask-AppBuilder < 3.4.4. Allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in.
Patches
Upgrade to 3.4.4
Workarounds
References
For more information
If you have any questions or comments about this advisory:
- Open an issue in example link to repo
- Email us at example email address
- Record
GHSA-wfjw-w6pv-8p7f- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Weakness
- CWE-203, CWE-204
- Updated
- 2026-11-02
OSVPYSEC-2022-24 No score
Flask-AppBuilder is an application development framework, built on top of the Flask web framework. In affected versions there exists a user enumeration vulnerability. This vulnerability allows for a non authenticated user to enumerate existing accounts by timing the response time from the server when you are logging in. Users are advised to upgrade to version 3.4.4 as soon as possible. There are no known workarounds for this issue.
- Record
PYSEC-2022-24- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
flask-appbuilderPyPI |
before 3.4.4 | 3.4.4 |
flask-appbuilderPyPI |
before 3.4.4, plus listed versions 0.1.100.1.110.1.120.1.130.1.14 Show 45 moreShow less0.1.150.1.160.1.170.1.180.1.190.1.200.1.210.1.220.1.230.1.240.1.250.1.260.1.270.1.280.1.290.1.30.1.330.1.340.1.350.1.360.1.370.1.380.1.40.1.430.1.440.1.450.1.460.1.470.1.50.1.60.1.70.1.80.1.90.10.00.10.10.10.20.10.30.10.40.10.50.10.60.10.70.2.00.2.10.2.20.3.0 |
3.4.4 |
flask-appbuilderPyPI |
before 3.4.2, plus listed versions 0.1.100.1.110.1.120.1.130.1.14 Show 45 moreShow less0.1.150.1.160.1.170.1.180.1.190.1.200.1.210.1.220.1.230.1.240.1.250.1.260.1.270.1.280.1.290.1.30.1.330.1.340.1.350.1.360.1.370.1.380.1.40.1.430.1.440.1.450.1.460.1.470.1.50.1.60.1.70.1.80.1.90.10.00.10.10.10.20.10.30.10.40.10.50.10.60.10.70.2.00.2.10.2.20.3.0 |
3.4.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2022-21659 is a medium vulnerability (CVSS 5.3) in Dpgaspar Flask-appbuilder, published January 31, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.95%, the 61st percentile. Fixed in flask-appbuilder 3.4.4.
References
github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-wfjw-w6pv-8p7f
nvd.nist.gov/vuln/detail/CVE-2022-21659
Left out here: 415 versions. The JSON record has them.