CVE-2021-40347

Public Exploit

Description

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.

5.4

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.21%

Vendor Advisory debian.org

Affected: n/a n/a

References

Link	Tags
https://gitlab.com/mailman/postorius/-/issues/531	issue tracking patch exploit third party advisory
https://phabricator.wikimedia.org/T289798	exploit third party advisory patch
https://gitlab.com/mailman/postorius/-/tags	third party advisory
https://www.debian.org/security/2021/dsa-4970	third party advisory vendor advisory
https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b	third party advisory patch
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-40347?: CVE-2021-40347 has been scored as a medium severity vulnerability.
How to fix CVE-2021-40347?: To fix CVE-2021-40347, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-40347 being actively exploited in the wild?: It is possible that CVE-2021-40347 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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