CVE-2026-44742 json
Postorius is vulnerable to XSS
published 2026-05-07 6 mo ago modified 2026-07-13 3 mo ago also GHSA-r7c9-7pjq-hmm8 , PYSEC-2026-2891 , EUVD-2026-28415
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
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.
Patch / fix
- postorius Debian 12 1.3.8-3+deb12u1
- postorius Debian 13 1.3.13-1+deb13u1
debian advisories DEBIAN-CVE-2026-44742
- postorius Ubuntu 25.10 1.3.13-1ubuntu1.1~25.10.1
- postorius Ubuntu 26.04 LTS 1.3.13-1ubuntu1.1~26.04.1
- postorius Ubuntu Pro 18.04 LTS 1.1.2-3ubuntu0.1+esm1
- postorius Ubuntu Pro 20.04 LTS 1.2.4-1ubuntu0.1+esm1
- postorius Ubuntu Pro 22.04 LTS 1.3.5-1ubuntu0.1~esm1
- postorius Ubuntu Pro 24.04 LTS 1.3.10-1ubuntu0.1~esm1
ubuntu advisories UBUNTU-CVE-2026-44742
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- python-postorius openSUSE Tumbleweed 1.3.13-8.1
opensuse advisories openSUSE-SU-2026:11539-1
- gitlab.com/mailman/postorius@c4706ab commit
- gitlab.com/mailman/postorius#972 pull request
- openwall.com/lists/oss-security/2026/05/07/3 advisory
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-44742 updated cvss 5.4
Postorius: Postorius: Cross-Site Scripting via unescaped HTML in message subject
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | postorius | <=1.3.13 |
no fix listed |
Affected products
- Postorius project Postorius
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
gitlab.com
/mailman/postorius/-/commit/c4706abd05ba6bcf472fc674b160d3a9d6a4868b
web, patch
-
gitlab.com
/mailman/postorius/-/merge_requests/972
web, issue-tracking, patch
-
openwall.com
/lists/oss-security/2026/05/07/3
web, mailing-list, patch, third-party-advisory
-
gitlab.com
/mailman/postorius/-/issues/620
web, issue-tracking, vendor-advisory
- lists.debian.org /debian-lts-announce/2026/05/msg00045.html
-
nvd.nist.gov
/vuln/detail/CVE-2026-44742
advisory
-
gitlab.com
/mailman/postorius
package
-
pypi.org
/project/postorius
package
-
github.com
/advisories/GHSA-r7c9-7pjq-hmm8
advisory
Sources
- CVE List CVE-2026-44742
- GitHub Advisory GHSA-r7c9-7pjq-hmm8
- NVD CVE-2026-44742
- OSV PYSEC-2026-2891
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