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CVE-2021-40347

MEDIUM
5.4
CVSS Score
Published: September 10, 2021 at 06:17 PM UTC
Updated: June 17, 2026 at 04:06 AM UTC
1 product affected across 1 vendorPostorius

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Severity
MEDIUM5.4
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Postorius· Postorius Project
95%
v < 1.3.5
Affected range stops below 1.3.5, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMMailing ListThird Party Advisory
Source: [email protected]
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b
x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://gitlab.com/mailman/postorius/-/issues/531
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://gitlab.com/mailman/postorius/-/tags
x_refsource_MISCExploitPatchThird Party Advisory
Source: [email protected]
https://phabricator.wikimedia.org/T289798
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2021/dsa-4970

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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