CVE-2023-33175: ToUI is a Python package for creating user interfaces (websites and desktop apps) from HTML

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2023-33175 is a critical-severity flaw (CVSS 9.1) affecting toui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-914, CWE-913
Published	2023-05-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: toui project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-05-30 05:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

toui project toui UPGRADE

Affected: >= 2.0.1 and <= 2.4.0

Fixed in: newer than 2.4.0

Safe to downgrade to: a release before 2.0.1

1. Check installed version

apt-cache policy toui || rpm -q toui || toui --version

2. UPGRADE to newer than 2.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade toui

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade toui

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison toui sudo apt install toui=<VERSION_BEFORE_2.0.1> sudo apt-mark hold toui

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list toui sudo dnf downgrade toui-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add toui

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-33175?

toui: upgrade to newer than 2.4.0. Exact commands for each OS are on this page.

Is CVE-2023-33175 being exploited?

CVE-2023-33175 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-33175 affect?

CVE-2023-33175 affects toui. Severity is critical (CVSS 9.1). 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

How urgent is CVE-2023-33175?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · Flask vulnerabilities

References

← Back to latest CVEs