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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Postorius project Postorius unknown
Version Status Constraints
0 affected ≤ 1.3.13

No data.

No data.

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Vendors Products
Postorius Project Subscribe
Postorius Subscribe

Project Subscriptions

Vendors Products
Postorius Project Subscribe
Postorius Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gitlab.com/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b cve-icon cve-icon
https://gitlab.com/mailman/postorius/-/issues/620 cve-icon cve-icon
https://gitlab.com/mailman/postorius/-/merge_requests/972 cve-icon cve-icon
https://www.openwall.com/lists/oss-security/2026/05/07/3 cve-icon cve-icon
History

Thu, 07 May 2026 21:00:00 +0000

Type Values Removed Values Added
Title Unescaped HTML in Message Subject Enables XSS via Held Messages Pop‑up

Thu, 07 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 07 May 2026 19:00:00 +0000

Type Values Removed Values Added
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.
First Time appeared Postorius Project
Postorius Project postorius
Weaknesses CWE-79
CPEs cpe:2.3:a:postorius_project:postorius:*:*:*:*:*:*:*:*
Vendors & Products Postorius Project
Postorius Project postorius
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-08T06:25:34.759Z

Reserved: 2026-05-07T18:09:19.497Z

Link: CVE-2026-44742

cve-icon Vulnrichment

Updated: 2026-05-07T19:00:16.271Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-07T19:16:02.500

Modified: 2026-05-07T19:53:21.760

Link: CVE-2026-44742

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-07T20:45:22Z

Weaknesses