Vulnerability in postorius
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 UBUNTU-CVE-2026-44742 has been found in postorius.
Risk of unauthorized operations or information disclosure.
What to do: upgrade postorius to 1.3.13-1ubuntu1.1~25.10.1 or later.
If unsure, ask your IT team or search "postorius UBUNTU-CVE-2026-44742" on the vendor's site.
UBUNTU-CVE-2026-44742 (postorius)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.3.13-1ubuntu1.1~25.10.1 — apply immediately
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.
A vulnerability (unclassified) exists in postorius.
Check the vendor advisory for the affected versions of postorius.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.3.13-1ubuntu1.1~25.10.1.
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
Apply patchpatch
Upgrade postorius to 1.3.13-1ubuntu1.1~25.10.1ステージング環境で 1.3.13-1ubuntu1.1~25.10.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3
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 |
|---|---|---|---|
| Ubuntu:18.04:LTS | postorius |
All versions |
— |
| Ubuntu:20.04:LTS | postorius |
All versions |
— |
| Ubuntu:22.04:LTS | postorius |
All versions |
— |
| Ubuntu:24.04:LTS | postorius |
All versions |
— |
| Ubuntu:25.10 | postorius |
< 1.3.13-1ubuntu1.1~25.10.1 |
1.3.13-1ubuntu1.1~25.10.1 |
| Ubuntu:26.04 | postorius |
All versions |
— |
| Ubuntu:26.04:LTS | postorius |
< 1.3.13-1ubuntu1.1~26.04.1 |
1.3.13-1ubuntu1.1~26.04.1 |
| Ubuntu:Pro:18.04:LTS | postorius |
< 1.1.2-3ubuntu0.1+esm1 |
1.1.2-3ubuntu0.1+esm1 |
| Ubuntu:Pro:20.04:LTS | postorius |
< 1.2.4-1ubuntu0.1+esm1 |
1.2.4-1ubuntu0.1+esm1 |
| Ubuntu:Pro:22.04:LTS | postorius |
< 1.3.5-1ubuntu0.1~esm1 |
1.3.5-1ubuntu0.1~esm1 |
| Ubuntu:Pro:24.04:LTS | postorius |
< 1.3.10-1ubuntu0.1~esm1 |
1.3.10-1ubuntu0.1~esm1 |
| Ubuntu:26.10 | postorius |
All versions |
— |
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: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org
- report gitlab.com
- report gitlab.com