Postorius up to 1.3.13 cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Postorius up to 1.3.13. The affected element is an unknown function. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-44742. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability has been found in Postorius up to 1.3.13 and classified as problematic. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at gitlab.com. This vulnerability is known as CVE-2026-44742 since 05/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 313182 (Linux Distros Unpatched Vulnerability : CVE-2026-44742), which helps to determine the existence of the flaw in a target environment.

Applying the patch c4706abd05ba6bcf472fc674b160d3a9d6a4868b is able to eliminate this problem. The bugfix is ready for download at gitlab.com.

The vulnerability is also documented in the vulnerability database at Tenable (313182). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Postorius

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4
• 1.3.5
• 1.3.6
• 1.3.7
• 1.3.8
• 1.3.9
• 1.3.10
• 1.3.11
• 1.3.12
• 1.3.13

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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