#VU79967 Stored cross-site scripting in alertmanager - CVE-2023-40577

Vulnerability identifier: #VU79967

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-40577

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
alertmanager
Other software / Other software solutions

Vendor: Prometheus

Description

The disclosed vulnerability allows a remote user to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data passed to the /api/v1/alerts endpoint in the Alertmanager UI. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

alertmanager: 0.0.1 - 0.25.0

---

External links
https://github.com/prometheus/alertmanager/releases/tag/v0.26.0
https://github.com/prometheus/alertmanager/releases/tag/v0.25.1

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.