Cross-Site Scripting (XSS) in activemq (CVE-2026-42253)
Summary
Cross-site scripting in activemq (CVE-2026-42253). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.19.7, 6.2.6 or later.
Original description
The description as published by the source.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache ActiveMQ, Apache ActiveMQ Web.
The MessageServlet in the ActiveMQ web console API copies every JMS message
property into an HTTP response header without any validation. This can allow overwriting and injecting security headers by setting them on JMS messages that are returned by the servlet.
This issue affects Apache ActiveMQ: before 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ Web: before 5.19.7, from 6.0.0 before 6.2.6.
Users are recommended to upgrade to version 5.19.7 or 6.2.6, which fixes the issue. The MessageServlet has now been deprecated and disabled by default.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
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-2026-42253 has been found in activemq.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade activemq to 5.19.7, 6.2.6 or later.
If unsure, ask your IT team or search "activemq CVE-2026-42253" on the vendor's site.
CVE-2026-42253 (activemq) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Patched: 5.19.7, 6.2.6 — 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.
Cross-site scripting (XSS) (CWE-79) exists in activemq.
Check the vendor advisory for the affected versions of activemq.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to 5.19.7, 6.2.6.
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 'activemq' . 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
-
1Identify exposure identify
grep -r 'activemq' . | 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
activemqを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade activemq to 5.19.7, 6.2.6ステージング環境で 5.19.7, 6.2.6 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。
-
3Post-deployment verification verify
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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-42253 activemq
- Ubuntu UBUNTU-CVE-2026-42253 activemq
References
- advisory lists.apache.org
- advisory openwall.com
- package github.com
- web nvd.nist.gov
- web github.com