CVE-2023-40577

Name	CVE-2023-40577
Description	Alertmanager handles alerts sent by client applications such as the Prometheus server. An attacker with the permission to perform POST requests on the /api/v1/alerts endpoint could be able to execute arbitrary JavaScript code on the users of Prometheus Alertmanager. This issue has been fixed in Alertmanager version 0.2.51.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3609-1
Debian Bugs	1050558

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
prometheus-alertmanager (PTS)	bullseye	0.21.0+ds-4	vulnerable
	bookworm	0.25.0-1	vulnerable
	trixie	0.28.1+ds-1	fixed
	forky, sid	0.28.1+ds-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
prometheus-alertmanager	source	buster	0.15.3+ds-3+deb10u1		DLA-3609-1
prometheus-alertmanager	source	(unstable)	0.26.0+ds-1	unimportant		1050558

Notes

https://github.com/prometheus/alertmanager/security/advisories/GHSA-v86x-5fm3-5p7j
https://github.com/prometheus/alertmanager/commit/8b9f2fd20c25e0d1e76aa0b407f7e354996d8e72 (v0.25.1)
Debian package doesn't ship the UI