Vulnerability-Lookup

CVE-2026-44742 (GCVE-0-2026-44742)

Vulnerability from cvelistv5 – Published: 2026-05-07 18:09 – Updated: 2026-05-25 23:25

Previdian

Summary

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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-07 19:00 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Assigner

mitre mitre root

References

5 references

URL	Tags
https://gitlab.com/mailman/postorius/-/commit/c47…
https://gitlab.com/mailman/postorius/-/merge_requ…
https://gitlab.com/mailman/postorius/-/issues/620
https://www.openwall.com/lists/oss-security/2026/…
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

1 product

Vendor	Product	Version	CPE status
Postorius project	Postorius	Affected: 0 , ≤ 1.3.13 (semver) cpe:2.3:a:postorius_project:postorius::::::::

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: c4015df2-c2aa-475a-9fd4-f457982e3f51

Vulnerability ID: CVE-2026-44742

Status: Confirmed

Status Updated: 2026-06-01 13:26 UTC

Exploited: Yes

Timestamps

First Seen: 2026-06-01

Asserted: 2026-06-01

Scope

Notes: KEVIntel entry: 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... | Affected: Postorius project / Postorius | CVSS: 7.2 (HIGH) | EPSS: 0.00237 | Used in malware: unknown | Not yet in CISA KEV: True

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	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...
Vendor	Postorius project
Product	Postorius
Added Date	2026-06-01T13:26:33.175Z
Cvss Score	7.2
Epss Score	0.00237
Cvss Severity	HIGH
Epss Percentile	0.14448
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	True

References

Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44742

Vulnerability from fkie_nvd - Published: 2026-05-07 19:16 - Updated: 2026-06-17 10:51

Previdian

Severity

7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

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.

References

URL	Tags
cve@mitre.org	https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b	Patch
cve@mitre.org	https://gitlab.com/mailman/postorius/-/issues/620	Issue Tracking, Vendor Advisory
cve@mitre.org	https://gitlab.com/mailman/postorius/-/merge_requests/972	Issue Tracking, Patch
cve@mitre.org	https://www.openwall.com/lists/oss-security/2026/05/07/3	Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2026/05/msg00045.html

Impacted products

	Vendor	Product	Version
	postorius_project	postorius	*

JSON

To clipboard

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          "role": "CISA Coordinator",
          "timestamp": "2026-05-07T19:00:12.476643Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-07T19:16:02.500",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://gitlab.com/mailman/postorius/-/issues/620"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://gitlab.com/mailman/postorius/-/merge_requests/972"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.openwall.com/lists/oss-security/2026/05/07/3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00045.html"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}

GHSA-R7C9-7PJQ-HMM8

Vulnerability from github – Published: 2026-05-07 21:30 – Updated: 2026-05-12 16:20

Summary

Postorius is vulnerable to XSS

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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "postorius"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.3.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44742"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-12T16:20:35Z",
    "nvd_published_at": "2026-05-07T19:16:02Z",
    "severity": "HIGH"
  },
  "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": "GHSA-r7c9-7pjq-hmm8",
  "modified": "2026-05-12T16:20:35Z",
  "published": "2026-05-07T21:30:29Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "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"
}

OPENSUSE-SU-2026:11539-1

Vulnerability from csaf_opensuse - Published: 2026-08-18 00:00 - Updated: 2026-09-17 17:20

Summary

postorius-1.3.13-8.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-44742.

CVE-2026-44742

6.1 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Recommended: 16 products

Open the full advisory

PYSEC-2026-2891

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

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

JSON

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"
}

UBUNTU-CVE-2026-44742 (CVE-2026-44742)

Vulnerability from osv_ubuntu – Published: 2026-05-07 19:16 – Updated: 2026-05-27 17:53 – Source website

Previdian

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

6.1 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-44742	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-44742	REPORT
	https://gitlab.com/mailman/postorius/-/commit/c47…	REPORT
	https://gitlab.com/mailman/postorius/-/merge_requ…	REPORT
	https://ubuntu.com/security/notices/USN-8323-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python-django-postorius",
            "binary_version": "1.1.2-3ubuntu0.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.1.2-3ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.1.2-3ubuntu0.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-1",
        "1.1.1-1",
        "1.1.2-1",
        "1.1.2-2",
        "1.1.2-3",
        "1.1.2-3ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.2.4-1ubuntu0.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.2.4-1ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.4-1ubuntu0.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.4-1",
        "1.2.4-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.5-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.3.5-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.5-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.4-2",
        "1.3.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.10-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.3.10-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.10-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.8-3",
        "1.3.10-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.13-1ubuntu1.1~25.10.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.3.13-1ubuntu1.1~25.10.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.13-1ubuntu1.1~25.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.13-1",
        "1.3.13-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-django-postorius",
            "binary_version": "1.3.13-1ubuntu1.1~26.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "postorius",
        "purl": "pkg:deb/ubuntu/postorius@1.3.13-1ubuntu1.1~26.04.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.13-1ubuntu1.1~26.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.13-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "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": "UBUNTU-CVE-2026-44742",
  "modified": "2026-05-27T17:53:03Z",
  "published": "2026-05-07T19:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44742"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-44742"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/mailman/postorius/-/merge_requests/972"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8323-1"
    }
  ],
  "related": [
    "USN-8323-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-44742"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-44742 (GCVE-0-2026-44742)

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

FKIE_CVE-2026-44742

GHSA-R7C9-7PJQ-HMM8

OPENSUSE-SU-2026:11539-1

PYSEC-2026-2891

UBUNTU-CVE-2026-44742 (CVE-2026-44742)

Tags

Sightings

Nomenclature

Related by attack behaviour