CVE-2025-27609 Icinga Web 2 Vulnerable to Reflected XSS

What is CVE-2025-27609?

CVE-2025-27609 is a low-severity cross-site scripting vulnerability in icingaweb2, published on 26 Mar 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Icinga Web 2 is an open source monitoring web interface, framework and command-line interface. A vulnerability in versions prior to 2.11.5 and 2.12.13 allows an attacker to craft a request that, once transmitted to a victim's Icinga Web, allows to embed arbitrary Javascript into it and to act on behalf of that user. This issue has been resolved in versions 2.11.5 and 2.12.3 of Icinga Web 2. As a workaround, those who have Icinga Web 2.12.2 may enable a content security policy in the application settings. Any modern browser with a working CORS implementation also sufficiently guards against the vulnerability.

Weakness: CWE-79

Which versions are affected by CVE-2025-27609?

It affects 1 product.

Products include Icinga Icinga Web 2.

How do I fix CVE-2025-27609?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-27609 being exploited?

There is no known exploitation of CVE-2025-27609 in the wild and no public exploit code.

Other vulnerabilities in icingaweb2

• CVE-2018-18249 Code injection in n/a Critical 9.8
• CVE-2022-24715 Arbitrary code execution for authenticated users in Icinga Web 2 High 8.5
• CVE-2025-27404 Icinga Web 2 DOM-based XSS vulnerability High 7.7
• CVE-2025-27405 Icinga Web 2 has XSS in embedded content High 7.7
• CVE-2022-24716 Path traversal in Icinga Web 2 High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2025-27609, GHSA-5cjw-fwjc-8j38, UBUNTU-CVE-2025-27609.