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CVE-2025-27405: Icinga Web 2 has XSS in embedded content

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-26 · updated 2026-06-17
• Weakness: CWE-79

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 URL that, once visited by any user, allows to embed arbitrary Javascript into Icinga Web 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.

Affected products

• icingaweb2: before 2.11.5; from 2.12.0 before 2.12.3 — fixed in 2.11.5, 2.12.3

How to fix

Upgrade to a fixed version: icingaweb2 2.11.5, 2.12.3. Check the vendor advisory for mitigations.

References

• https://github.com/Icinga/icingaweb2/releases/tag/v2.11.5
• https://github.com/Icinga/icingaweb2/releases/tag/v2.12.3
• https://github.com/Icinga/icingaweb2/security/advisories/GHSA-3x37-fjc3-ch8w

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