CVE-2026-44742

EUVD-2026-28415
Postorius through 1.3.13 does not escape HTML in the message subject when rendering it in the Held messages pop-up, as exploited in the wild in May 2026.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 14.74%
Affected Products (NVD)
VendorProductVersion
postorius_projectpostorius
𝑥
≤ 1.3.13
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
postorius
bookworm
1.3.8-3+deb12u1
fixed
bookworm (security)
1.3.8-3+deb12u1
fixed
bullseye
vulnerable
bullseye (security)
1.3.4-2+deb11u2
fixed
forky
vulnerable
sid
vulnerable
trixie
1.3.13-1+deb13u1
fixed
trixie (security)
1.3.13-1+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
postorius
bionic
Fixed 1.1.2-3ubuntu0.1+esm1
released
focal
Fixed 1.2.4-1ubuntu0.1+esm1
released
jammy
Fixed 1.3.5-1ubuntu0.1~esm1
released
noble
Fixed 1.3.10-1ubuntu0.1~esm1
released
questing
Fixed 1.3.13-1ubuntu1.1~25.10.1
released
resolute
Fixed 1.3.13-1ubuntu1.1~26.04.1
released
Common Weakness Enumeration
References
https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b
https://gitlab.com/mailman/postorius/-/issues/620
https://gitlab.com/mailman/postorius/-/merge_requests/972
https://www.openwall.com/lists/oss-security/2026/05/07/3
https://lists.debian.org/debian-lts-announce/2026/05/msg00045.html