CVE-2023-40577

Name: CVE-2023-40577
Creator: NVD / NIST
Published: 2023-08-25T01:15:09.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2023-40577 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.57%

42.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Prometheus	Alertmanager	0.25.0
Debian	Debian Linux	10.0

References

https://github.com/prometheus/alertmanager/security/advisories/GHSA-v86x-5fm3-5p7jVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00011.htmlMailing List
https://github.com/prometheus/alertmanager/security/advisories/GHSA-v86x-5fm3-5p7jVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00011.htmlMailing List

Timeline

Published: Aug 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40577?

How severe is CVE-2023-40577?

CVE-2023-40577 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40577?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-40577?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST