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CVE-2021-33038

Exposure of sensitive information to an unauthorized actor in HyperKitty

7.5 HighFix available

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

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
None
Availability
None

Exploit likelihood

1.85%Up 1.2 points since May 27, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
CVE-2021-33038
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-276
Updated
2026-11-02
CVE List No score

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
CVE-2021-33038
Updated
2026-11-02
EUVDEUVD-2021-0099 No score

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
EUVD-2021-0099
Updated
2026-11-03
GitHub AdvisoriesGHSA-h39g-q63v-4h9p 8.7

Exposure of sensitive information to an unauthorized actor in HyperKitty

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.

Record
GHSA-h39g-q63v-4h9p
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSV 7.5

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
CVE-2021-33038
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-33038 7.5

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
DEBIAN-CVE-2021-33038
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 5 moreShow less
OSVGHSA-h39g-q63v-4h9p 8.7

Exposure of sensitive information to an unauthorized actor in HyperKitty

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.

Record
GHSA-h39g-q63v-4h9p
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVUBUNTU-CVE-2021-33038 7.5

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
UBUNTU-CVE-2021-33038
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2021:0861-1 No score

Security update for python-HyperKitty

This update for python-HyperKitty fixes the following issues:

  • CVE-2021-33038 [boo#1186575], information disclosure when importing a private mailing list
Record
openSUSE-SU-2021:0861-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11207-1 No score

HyperKitty-web-1.3.4-5.2 on GA media

These are all security issues fixed in the HyperKitty-web-1.3.4-5.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11207-1
Updated
2026-11-02
OSVPYSEC-2021-77 No score

An issue was discovered in management/commands/hyperkitty_import.py in HyperKitty through 1.3.4. 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.

Record
PYSEC-2021-77
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
hyperkitty
PyPI
 before 1.3.5
1.3.5
hyperkitty
Debian:12
 before 1.3.4-4
1.3.4-4
hyperkitty
Debian:13
 before 1.3.4-4
1.3.4-4
hyperkitty
Debian:14
 before 1.3.4-4
1.3.4-4
hyperkitty
Debian:10
 before 1.2.2-1+deb10u1, plus listed versions
1.2.2-1
1.2.2-1+deb10u1
hyperkitty
PyPI
 before 1.3.5, plus listed versions
0.10.1.10.1.20.1.30.1.4
Show 28 moreShow less
0.1.50.1.60.1.70.9.30.9.50.9.60.9.71.0.01.0.0rc11.0.11.0.21.0.31.1.01.1.11.1.41.2.01.2.0a11.2.11.2.21.3.01.3.11.3.21.3.31.3.3rc11.3.3rc21.3.41.3.4rc11.3.4rc2
1.3.5
hyperkitty
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.1.4-21.1.4-31.1.4-4
 None known
hyperkitty
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.2.2-11.3.0-1ubuntu11.3.0-1.1ubuntu11.3.2-1
 None known
hyperkitty
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.3.4-41.3.5-1+really1.3.4-1
 None known
hyperkitty
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.3.7-1ubuntu2
 None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
hyperkitty
Ubuntu:25.10
 All versions, plus listed versions
1.3.12-21.3.12-31.3.12-3ubuntu1
 None known
hyperkitty
Ubuntu:26.10
 All versions, plus listed versions
1.3.12-3ubuntu11.3.12-7
 None known
hyperkitty
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.3.12-3ubuntu1
 None known
python-HyperKitty
openSUSE:Leap 15.2
 before 1.3.2-lp152.2.3.1
1.3.2-lp152.2.3.1

History

History
RecordedChangedSources
facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-33038 is a high vulnerability (CVSS 7.5) in Hyperkitty Project Hyperkitty, published May 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.85%, the 79th percentile. Fixed in hyperkitty 1.3.5.

References

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