PYSEC-2026-2891

Vulnerability from pysec - Published: 2026-07-13 15:15 - Updated: 2026-07-13 16:05
VLAI
Details

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.

Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Impacted products
Name purl
postorius pkg:pypi/postorius
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "postorius",
        "purl": "pkg:pypi/postorius"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.3.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0",
        "1.0.0a1",
        "1.0.0a2",
        "1.0.0b1",
        "1.0.0b2",
        "1.0.0b3",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.1.0",
        "1.1.1",
        "1.1.2",
        "1.2.0",
        "1.2.0a1",
        "1.2.1",
        "1.2.2",
        "1.2.3",
        "1.2.4",
        "1.3.0",
        "1.3.1",
        "1.3.10",
        "1.3.11",
        "1.3.12",
        "1.3.13",
        "1.3.13a1",
        "1.3.2",
        "1.3.3",
        "1.3.3rc1",
        "1.3.3rc2",
        "1.3.4",
        "1.3.4rc1",
        "1.3.5",
        "1.3.6",
        "1.3.6b1",
        "1.3.7",
        "1.3.8",
        "1.3.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44742",
    "GHSA-r7c9-7pjq-hmm8"
  ],
  "details": "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.",
  "id": "PYSEC-2026-2891",
  "modified": "2026-07-13T16:05:37.225517Z",
  "published": "2026-07-13T15:15:40.939562Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44742"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/mailman/postorius"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/mailman/postorius/-/issues/620"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/mailman/postorius/-/merge_requests/972"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2026/05/07/3"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/postorius"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-r7c9-7pjq-hmm8"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Postorius is vulnerable to XSS"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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