Cross-site scripting in Postorius
Priority LOW 37CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00237 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Postorius project | Postorius | up to 1.3.13 | — | No fix listed | CNA |
| — | postorius (PyPI) | up to 1.3.13 | — | No fix listed | GHSA-r7c9-7pjq-hmm8 |
- Postorius VendorPostorius project Affected up to 1.3.13 Fixed in — No fix listed CNA
- postorius (PyPI) Vendor— Affected up to 1.3.13 Fixed in — No fix listed GHSA-r7c9-7pjq-hmm8
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:postorius_project:postorius:*:*:*:*:*:*:*:* | up to 1.3.13 | Vulnerable | Postorius project |
- cpe:2.3:a:postorius_project:postorius:*:*:*:*:*:*:*:* Versions up to 1.3.13 Vulnerable ·Postorius project
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44742
- 2026-10-03 Alias added: GHSA-r7c9-7pjq-hmm8
References
Patch 3
Advisory 2
More Postorius project Postorius vulnerabilities
- TI-2021-17419 An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. CVSS 3.1MEDIUM 5.4
Sources
- CVE-2026-44742 · CVE Program
- CVE-2026-44742 · NVD
- FIRST EPSS
- GHSA-r7c9-7pjq-hmm8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-44742 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences