XSS in Icinga Web 2
CVE-2025-27609
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Icinga Web 2
- Icinga Icingaweb2 — versions < 2.11.5, >= 2.12.0, < 2.12.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/Icinga/icingaweb2/security/advisories/GHSA-5cjw-fwjc-8j38 (Vendor Advisory)
- github.com/Icinga/icingaweb2/releases/tag/v2.11.5 (Release Notes)
- github.com/Icinga/icingaweb2/releases/tag/v2.12.3 (Release Notes)
Frequently asked questions
- What is CVE-2025-27609?
- CVE-2025-27609 is a medium-severity vulnerability in Icinga Web 2, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-03-26.
- How severe is CVE-2025-27609?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2025-27609 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.