CVE-2026-44742

Postorius is vulnerable to XSS

7.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.24%Up 0.2 points since May 8, 2026

What each source reports

CVE List Score used 7.2

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.

Record: CVE-2026-44742
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-28415 7.2

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.

Record: EUVD-2026-28415
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-r7c9-7pjq-hmm8 7.2

Postorius is vulnerable to XSS

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.

Record: GHSA-r7c9-7pjq-hmm8
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 7.2

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.

Record: CVE-2026-44742
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 7.2

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.

Record: CVE-2026-44742
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-44742 6.1

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.

Record: DEBIAN-CVE-2026-44742
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

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OSVGHSA-r7c9-7pjq-hmm8 7.2

Postorius is vulnerable to XSS

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.

Record: GHSA-r7c9-7pjq-hmm8
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVPYSEC-2026-2891 7.2

Postorius is vulnerable to XSS

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.

Record: PYSEC-2026-2891
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-44742 7.2

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.

Record: UBUNTU-CVE-2026-44742
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVopenSUSE-SU-2026:11539-1 No score

postorius-1.3.13-8.1 on GA media

These are all security issues fixed in the postorius-1.3.13-8.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:11539-1
Updated: 2026-11-02

OSVUSN-8323-1 No score

postorius vulnerability

It was discovered that Postorius did not properly escape HTML in message subjects when rendering the Held messages pop-up. An attacker could possibly use this issue to inject arbitrary HTML, resulting in exposure of sensitive information.

Record: USN-8323-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`postorius` PyPI	through 1.3.13	None known
`postorius` Debian:12	before 1.3.8-3+deb12u1, plus listed versions 1.3.8-3	1.3.8-3+deb12u1
`postorius` Debian:13	before 1.3.13-1+deb13u1, plus listed versions 1.3.13-1	1.3.13-1+deb13u1
`postorius` Debian:14	All versions, plus listed versions 1.3.13-11.3.13-21.3.13-3	None known
`postorius` PyPI	through 1.3.13, plus listed versions 1.0.01.0.0a11.0.0a21.0.0b11.0.0b2 Show 31 moreShow less 1.0.0b31.0.11.0.21.0.31.1.01.1.11.1.21.2.01.2.0a11.2.11.2.21.2.31.2.41.3.01.3.11.3.101.3.111.3.121.3.13a11.3.21.3.31.3.3rc11.3.3rc21.3.41.3.4rc11.3.51.3.61.3.6b11.3.71.3.81.3.9	None known
`postorius` Ubuntu:Pro:18.04:LTS	before 1.1.2-3ubuntu0.1+esm1, plus listed versions 1.1.0-11.1.1-11.1.2-11.1.2-21.1.2-31.1.2-3ubuntu0.1	1.1.2-3ubuntu0.1+esm1
`postorius` Ubuntu:Pro:20.04:LTS	before 1.2.4-1ubuntu0.1+esm1, plus listed versions 1.2.4-11.2.4-1ubuntu0.1	1.2.4-1ubuntu0.1+esm1
`postorius` Ubuntu:Pro:22.04:LTS	before 1.3.5-1ubuntu0.1~esm1, plus listed versions 1.3.4-21.3.5-1	1.3.5-1ubuntu0.1~esm1
`postorius` Ubuntu:Pro:24.04:LTS	before 1.3.10-1ubuntu0.1~esm1, plus listed versions 1.3.8-31.3.10-1	1.3.10-1ubuntu0.1~esm1
`postorius` Ubuntu:25.10	before 1.3.13-1ubuntu1.1~25.10.1, plus listed versions 1.3.13-11.3.13-1ubuntu1	1.3.13-1ubuntu1.1~25.10.1
`postorius` Ubuntu:26.10	All versions, plus listed versions 1.3.13-1ubuntu1	None known
`postorius` Ubuntu:26.04:LTS	before 1.3.13-1ubuntu1.1~26.04.1, plus listed versions 1.3.13-1ubuntu1	1.3.13-1ubuntu1.1~26.04.1
`python-postorius` openSUSE:Tumbleweed	before 1.3.13-8.1	1.3.13-8.1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-44742 is a high vulnerability (CVSS 7.2) in Postorius Project Postorius, published May 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. Fixed in postorius 1.3.8-3+deb12u1.

References

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