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CVE-2026-67178 – Open Redirect – MISP installer-generated Apache configuration (versions before 2.5.

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Summary

CVE-2026-67178 is an open redirect vulnerability (CWE-601) affecting MISP installations before version 2.5.41. MISP installation scripts generated an Apache HTTP-to-HTTPS redirect that lacked a trailing slash on the destination URL, allowing an unauthenticated remote attacker to craft URLs on the legitimate MISP domain that redirect victims to attacker-controlled sites. The issue is rated HIGH severity (CVSS v4.0 base score 7.8).

Technical details

  • Root cause: MISP installation scripts created an Apache virtual-host configuration containing the directive Redirect permanent / https://misp.example without a trailing slash on the destination. Apache’s Redirect directive appends the portion of the requested path following the matched prefix directly to the configured destination URL, so the appended data was concatenated onto the hostname rather than onto its URL path.
  • Trigger conditions: An attacker crafts a URL under the legitimate MISP HTTP host, e.g. http://misp.example/@attacker.example/. The malformed redirect produces https://[email protected]/, where standard URL parsing treats misp.example as user information and attacker.example as the actual destination host. A victim must follow the crafted HTTP link.
  • Attack vector: Network; unauthenticated (no privileges required). Exploitation requires user interaction (the victim following the crafted URL).
  • Impact: Redirection of users from the trusted MISP domain to an attacker-controlled website, enabling phishing, credential collection, and potential disclosure of sensitive query-string information preserved during the redirect.

Affected software

  • MISP versions from 0 up to (but not including) 2.5.41, when installed using the affected installer-generated Apache configurations.
  • Affected installer/configuration files include: INSTALL/INSTALL.debian12.sh, INSTALL/INSTALL.debian13.sh, INSTALL/INSTALL.ubuntu2404.sh, INSTALL/apache.misp.centos7.ssl, and INSTALL/xINSTALL.rhel94.sh.

Severity

  • CVSS v4.0 base score: 7.8 (HIGH)
  • Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:H

Mitigation and recommended actions

  • Immediate: Upgrade to MISP 2.5.41 or later, which ships the corrected installation scripts.
  • If no patch (or for existing installations): Review the Apache HTTP virtual-host configuration and ensure the HTTPS redirect destination ends with a trailing slash — change Redirect permanent / https://misp.example to Redirect permanent / https://misp.example/. Validate the change with apachectl configtest and reload Apache to apply it.

References

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