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CVE-2021-40347

GNU Mailman Postorius Access Control Issues

5.4 MediumFix available

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

1.21%Down 0.2 points since Sep 11, 2021
90%50%10%1%

What each source reports

NVD Score used 5.4

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
CVE-2021-40347
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 2.0
5.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:N
Updated
2026-11-02
CVE List No score

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
CVE-2021-40347
Updated
2026-11-02
EUVDEUVD-2021-0197 No score

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
EUVD-2021-0197
Updated
2026-11-03
GitHub AdvisoriesGHSA-v83x-78q3-gr2j 5.3

GNU Mailman Postorius Access Control Issues

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
GHSA-v83x-78q3-gr2j
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-284
Updated
2026-11-02
OSV 5.4

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
CVE-2021-40347
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-40347 5.4

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
DEBIAN-CVE-2021-40347
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
Show 5 moreShow less
OSVGHSA-v83x-78q3-gr2j 5.3

GNU Mailman Postorius Access Control Issues

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
GHSA-v83x-78q3-gr2j
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-284
Updated
2026-11-02
OSVUBUNTU-CVE-2021-40347 5.4

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
UBUNTU-CVE-2021-40347
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2024:12306-1 No score

postorius-1.3.6-1.1 on GA media

These are all security issues fixed in the postorius-1.3.6-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:12306-1
Updated
2026-11-02
OSVPYSEC-2021-319 No score

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

Record
PYSEC-2021-319
Updated
2026-11-02
OSVUSN-5157-1 No score

postorius vulnerability

It was discovered that Postorius mishandled specially crafted input. An attacker could use this vulnerability that obtain sensitive information.

Record
USN-5157-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
postorius
PyPI
 before 1.3.5
1.3.5
postorius
Debian:12
 before 1.3.5-1
1.3.5-1
postorius
Debian:13
 before 1.3.5-1
1.3.5-1
postorius
Debian:14
 before 1.3.5-1
1.3.5-1
postorius
Debian:10
 before 1.2.4-1+deb10u1, plus listed versions
1.2.4-1
1.2.4-1+deb10u1
postorius
Debian:11
 before 1.3.4-2+deb11u1, plus listed versions
1.3.4-2
1.3.4-2+deb11u1
postorius
PyPI
 before 1.3.5, plus listed versions
1.0.01.0.0a11.0.0a21.0.0b11.0.0b2
Show 21 moreShow less
1.0.0b31.0.11.0.21.0.31.1.01.1.11.1.21.2.01.2.0a11.2.11.2.21.2.31.2.41.3.01.3.11.3.21.3.31.3.3rc11.3.3rc21.3.41.3.4rc1
1.3.5
postorius
Ubuntu:18.04:LTS
 before 1.1.2-3ubuntu0.1, plus listed versions
1.1.0-11.1.1-11.1.2-11.1.2-21.1.2-3
1.1.2-3ubuntu0.1
postorius
Ubuntu:20.04:LTS
 before 1.2.4-1ubuntu0.1, plus listed versions
1.2.4-1
1.2.4-1ubuntu0.1
postorius
Ubuntu:22.04:LTS
 before 1.3.5-1, plus listed versions
1.3.4-2
1.3.5-1

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-2021-40347 is a medium vulnerability (CVSS 5.4) in Postorius Project Postorius, published September 9, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.21%, the 68th percentile. Fixed in postorius 1.3.5.

References

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