---
id: CVE-2026-44742
aliases:
  - GHSA-r7c9-7pjq-hmm8
  - PYSEC-2026-2891
title: Postorius is vulnerable to XSS
summary: Postorius is vulnerable to XSS
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
vendor: postorius
product: postorius
ecosystem: pip
affected:
  - postorius <= 1.3.13
published: '2026-05-07'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-r7c9-7pjq-hmm8'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44742'
  - url: 'https://gitlab.com/mailman/postorius'
  - url: >-
      https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b
  - url: 'https://gitlab.com/mailman/postorius/-/issues/620'
  - url: 'https://gitlab.com/mailman/postorius/-/merge_requests/972'
  - url: 'https://www.openwall.com/lists/oss-security/2026/05/07/3'
tags:
  - osv
  - pip
epss: 0.00334
epssPercentile: 0.23942
ingestedAt: '2026-07-13T18:58:02.544Z'
---

## Overview

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

- `postorius <= 1.3.13`

## Remediation

Refer to the advisory for the patched release.