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Vulnerability · Published May 7, 2026 · Assigned by mitre

CVE-2026-44742

High 7.2

In plain English

A high-severity cross-site scripting in Postorius from Postorius project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.2%top 85.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12postorius1.3.8-3+deb12u1DEBIAN-CVE-2026-44742
Debian:13postorius1.3.13-1+deb13u1DEBIAN-CVE-2026-44742
Debian:14postoriusno fix listedDEBIAN-CVE-2026-44742
PyPIpostoriusno fix listedGHSA-r7c9-7pjq-hmm8
PyPIpostoriusno fix listedPYSEC-2026-2891
Ubuntu:25.10postorius1.3.13-1ubuntu1.1~25.10.1USN-8323-1
Ubuntu:25.10postorius1.3.13-1ubuntu1.1~25.10.1UBUNTU-CVE-2026-44742
Ubuntu:26.04:LTSpostorius1.3.13-1ubuntu1.1~26.04.1UBUNTU-CVE-2026-44742
Ubuntu:26.04:LTSpostorius1.3.13-1ubuntu1.1~26.04.1USN-8323-1
Ubuntu:26.10postoriusno fix listedUBUNTU-CVE-2026-44742

Affected products (as reported)

VendorProductVersions
Postorius project Postorius 0 – through 1.3.13

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References