CVE catalog

CVE-2021-40347

postorius: CVE-2021-40347

Severity: Medium · CVSS 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Published: Sep 9, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.19% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	postorius	sid	`1.3.13-3`	fixed
Debian	postorius	forky	`1.3.13-3`	fixed
Debian	postorius	trixie	`1.3.13-1+deb13u1`	fixed
Debian	postorius	trixie-security	`1.3.13-1+deb13u1`	fixed
Debian	postorius	bookworm	`1.3.8-3+deb12u1`	fixed
Debian	postorius	bookworm-security	`1.3.8-3+deb12u1`	fixed
Ubuntu	postorius	18.04	`1.1.0-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.1-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-2`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-3`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-3ubuntu0.1`	fixed
Ubuntu	postorius	20.04	`1.2.4-1`	vulnerable
Ubuntu	postorius	20.04	`1.2.4-1ubuntu0.1`	fixed
Ubuntu	postorius	18.04	`1.1.0-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.1-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-1`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-2`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-3`	vulnerable
Ubuntu	postorius	18.04	`1.1.2-3ubuntu0.1`	fixed
Ubuntu	postorius	20.04	`1.2.4-1`	vulnerable
Ubuntu	postorius	20.04	`1.2.4-1ubuntu0.1`	fixed
Ubuntu	postorius	22.04	`1.3.4-2`	vulnerable
Ubuntu	postorius	22.04	`1.3.5-1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	postorius	source	sid	`1.3.5-1`	not yet assigned	Not reported	[993746]
Debian	postorius	source	forky	`1.3.5-1`	not yet assigned	Not reported	[993746]
Debian	postorius	source	trixie	`1.3.5-1`	not yet assigned	Not reported	[993746]
Debian	postorius	source	bookworm	`1.3.5-1`	not yet assigned	Not reported	[993746]
Ubuntu	postorius	deb	18.04	`1.1.2-3ubuntu0.1`	Not reported	USN-5157-1	Not reported
Ubuntu	postorius	deb	20.04	`1.2.4-1ubuntu0.1`	Not reported	USN-5157-1	Not reported
Ubuntu	postorius	deb	18.04	`1.1.2-3ubuntu0.1`	Not reported	UBUNTU-CVE-2021-40347	Not reported
Ubuntu	postorius	deb	20.04	`1.2.4-1ubuntu0.1`	Not reported	UBUNTU-CVE-2021-40347	Not reported
Ubuntu	postorius	deb	22.04	`1.3.5-1`	Not reported	UBUNTU-CVE-2021-40347	Not reported

[Debian bug #993746]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[python3-django-postorius]Unknown
Source package: [postorius]
Details (4)
- 1.3.8-3+deb12u1 · all · bookworm
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · bookworm; dsa · postorius · debian · 12
- 1.3.8-3+deb12u1 · all · bookworm
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · bookworm; dsa · postorius · debian · 12
- 1.3.8-3+deb12u1 · all · bookworm-security
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · bookworm; dsa · postorius · debian · 12
- 1.3.8-3+deb12u1 · all · bookworm-security
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · bookworm; dsa · postorius · debian · 12

[Debian 13 (Trixie)]

[python3-django-postorius]Unknown
Source package: [postorius]
Details (4)
- 1.3.13-1+deb13u1 · all · trixie
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · 13
- 1.3.13-1+deb13u1 · all · trixie
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · 13
- 1.3.13-1+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · 13
- 1.3.13-1+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.3.5-1
  dsa · postorius · debian · 13

Observed: Oct 23, 2026, 6:02:24 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]