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Not in CISA KEV
HIGH severity

CVE-2021-33038 — hyperkitty

HIGH

CVE-2021-33038 is a high-severity (CVSS 7.5) Incorrect Default Permissions vulnerability in hyperkitty. 1 public exploit reference exists, so weaponization risk is real. A fix is available for hyperkitty — see the affected versions and patch details below.

Exposure of sensitive information to an unauthorized actor in HyperKitty

Also known asGHSA-h39g-q63v-4h9pPYSEC-2021-77
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.00%0.79%1.57%2.36%0.4%1.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-33038 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍hyperkitty

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty prior to 1.3.5. When importing a private mailing list's archives, these archives are publicly visible for the duration of the import. For example, sensitive information might be available on the web for an hour during a large migration from Mailman 2 to Mailman 3.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIhyperkittyall versions1.3.5pip install --upgrade 'hyperkitty==1.3.5'

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
10.0
Application
hyperkittyhyperkitty_project
≤ 1.3.4
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in management/commands/hyperkitty_import.py in H…

gitlab.comNVDJun 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hyperkitty, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update hyperkitty to 1.3.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33038 is resolved across your whole dependency graph.

  3. Workarounds

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Frequently Asked Questions

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty prior to 1.3.5. When importing a private mailing list's archives, these archives are publicly visible for the duration of the import. For example, sensitive information might be available on the web for an hour during a large migration from Mailman 2 to Mailman 3.
O3 Security · Impact-Aware SCA

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CVE-2021-33038: hyperkitty — Fixed in 1.3.5