CVE-2023-33175
ToUI allows user-specific variables to be shared between users
ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML. ToUI is using Flask-Caching (SimpleCache) to store user variables. Websites that use Website.user_vars property. It affects versions 2.0.1 to 2.4.0. This issue has been patched in version 2.4.1.
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
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
ToUI allows user-specific variables to be shared between users
ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML. ToUI is using Flask-Caching (SimpleCache) to store user variables. Websites that use Website.user_vars property. It affects versions 2.0.1 to 2.4.0. This issue has been patched in version 2.4.1.
- Record
CVE-2023-33175- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-914
- Updated
- 2026-11-02
EUVDEUVD-2023-1558
ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML. ToUI is using Flask-Caching (SimpleCache) to store user variables. Websites that use Website.user_vars property. It affects versions 2.0.1 to 2.4.0. This issue has been patched in version 2.4.1.
- Record
EUVD-2023-1558- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hh7j-pg39-q563
toui allows user-specific variables to be shared between users
Impact
Websites that use Website.user_vars property in versions.
Patches
It affects versions v2.0.1 to v2.4.0. Please upgrade to v2.4.1
Workarounds
Do not use Website.user_vars in websites when using versions v2.0.1 to v2.4.0. Also, do not use Website.signin_user() in version v2.4.0 only.
Explanation
ToUI is using Flask-Caching (SimpleCache) to store user variables. My misunderstanding was that these caches are stored in the client's browser, but it seems that these are stored in the server side.
- Record
GHSA-hh7j-pg39-q563- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-913, CWE-914
- Updated
- 2026-11-02
NVD
ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML. ToUI is using Flask-Caching (SimpleCache) to store user variables. Websites that use Website.user_vars property. It affects versions 2.0.1 to 2.4.0. This issue has been patched in version 2.4.1.
- Record
CVE-2023-33175- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-914, CWE-913
- Updated
- 2026-11-02
OSV
ToUI allows user-specific variables to be shared between users
ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML. ToUI is using Flask-Caching (SimpleCache) to store user variables. Websites that use Website.user_vars property. It affects versions 2.0.1 to 2.4.0. This issue has been patched in version 2.4.1.
- Record
CVE-2023-33175- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-914
- Updated
- 2026-11-02
OSVGHSA-hh7j-pg39-q563
toui allows user-specific variables to be shared between users
Impact
Websites that use Website.user_vars property in versions.
Patches
It affects versions v2.0.1 to v2.4.0. Please upgrade to v2.4.1
Workarounds
Do not use Website.user_vars in websites when using versions v2.0.1 to v2.4.0. Also, do not use Website.signin_user() in version v2.4.0 only.
Explanation
ToUI is using Flask-Caching (SimpleCache) to store user variables. My misunderstanding was that these caches are stored in the client's browser, but it seems that these are stored in the server side.
- Record
GHSA-hh7j-pg39-q563- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-913, CWE-914
- Updated
- 2026-11-02
OSVPYSEC-2026-555
toui allows user-specific variables to be shared between users
Impact
Websites that use Website.user_vars property in versions.
Patches
It affects versions v2.0.1 to v2.4.0. Please upgrade to v2.4.1
Workarounds
Do not use Website.user_vars in websites when using versions v2.0.1 to v2.4.0. Also, do not use Website.signin_user() in version v2.4.0 only.
Explanation
ToUI is using Flask-Caching (SimpleCache) to store user variables. My misunderstanding was that these caches are stored in the client's browser, but it seems that these are stored in the server side.
- Record
PYSEC-2026-555- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-33175 is a critical vulnerability (CVSS 9.1) in Mubarakalmehairbi Toui, published May 24, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile. Fixed in toui 2.4.1.
References
github.com/mubarakalmehairbi/ToUI/security/advisories/GHSA-hh7j-pg39-q563
nvd.nist.gov/vuln/detail/CVE-2023-33175
pypi.org/project/toui