CVE-2025-27405: Icinga Web 2 is an open source monitoring web interface, framework and command-line interface

Routine

HIGH 7.6UPGRADE

CVE-2025-27405 is a high-severity flaw (CVSS 7.6) affecting icinga web 2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 conten

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: icinga

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-26 16:15 UTCPublished CVE record published
2026-06-17 09:03 UTCUpdated Record last modified

icinga icinga web 2 UPGRADE

Affected: < 2.11.5 · >= 2.12.0 and < 2.12.3

Fixed in: 2.11.5, 2.12.3

Safe to downgrade to: a release before 2.12.0

1. Check installed version

apt-cache policy icinga-web-2 || rpm -q icinga-web-2 || icinga-web-2 --version

2. UPGRADE to 2.11.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade icinga-web-2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade icinga-web-2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.12.0 (Debian / Ubuntu)

apt-cache madison icinga-web-2 sudo apt install icinga-web-2=<VERSION_BEFORE_2.12.0> sudo apt-mark hold icinga-web-2

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list icinga-web-2 sudo dnf downgrade icinga-web-2-<VERSION_BEFORE_2.12.0> sudo dnf versionlock add icinga-web-2

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-27405?

icinga web 2: upgrade to 2.11.5, 2.12.3. Exact commands for each OS are on this page.

Is CVE-2025-27405 being exploited?

CVE-2025-27405 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-27405 affect?

CVE-2025-27405 affects icinga web 2. Severity is high (CVSS 7.6). 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 arbitra

How urgent is CVE-2025-27405?

Priority 33/100. High severity

Related CVEs

CVE-2025-30164 MEDIUM 4.1 UPGRADE Icinga Web 2 is an open source monitoring web interface, framework and command-line interface
CVE-2025-27609 MEDIUM 5.4 UPGRADE Icinga Web 2 is an open source monitoring web interface, framework and command-line interface
CVE-2025-27404 HIGH 7.6 UPGRADE Icinga Web 2 is an open source monitoring web interface, framework and command-line interface

References

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