Cross-Site Scripting (XSS) in postorius
Summary
Cross-site scripting in postorius (CVE-2026-44742). Risk of unauthorized operations or information disclosure.
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44742 has been found in postorius.
Risk of unauthorized operations or information disclosure. CVSS score: 7.2/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "postorius CVE-2026-44742" on the vendor's site.
CVE-2026-44742 (postorius) — CWE-79 / CVSS v3 7.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in postorius.
Check the vendor advisory for the affected versions of postorius.
Severity: High (CVSS 7.2/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'postorius' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'postorius' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
postoriusを grep し、稼働しているサービス・バージョンを把握する。 -
2
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| pip | postorius |
All versions |
— |
| PyPI | postorius |
≤ 1.3.13 |
— |
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-44742 postorius Fixed in: 1.3.4-2+deb11u2
- Ubuntu UBUNTU-CVE-2026-44742 postorius
Original description The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
References
- advisory nvd.nist.gov
- advisory github.com
- package gitlab.com
- patch gitlab.com
- patch gitlab.com
- report gitlab.com
- web openwall.com
- web github.com
- web lists.debian.org