What is CVE-2023-4321?

CVE-2023-4321 is a medium-severity vulnerability in Agentejo Cockpit, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-08-14.

How severe is CVE-2023-4321?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2023-4321 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Agentejo Cockpit

CVE-2023-4321

Cross-site Scripting (XSS) - Stored in GitHub repository cockpit-hq/cockpit prior to 2.4.3.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-08-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Agentejo Cockpit
Cockpit-Hq Cockpit-Hq/cockpit — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

huntr.dev/bounties/fce38751-bfd6-484c-b6e1-935e0aa8ffdc (Exploit, Patch, Third Party Advisory)
github.com/cockpit-hq/cockpit/commit/34ab31ee9362da51b9709e178469dbffd7717249 (Patch)

Frequently asked questions

What is CVE-2023-4321?: CVE-2023-4321 is a medium-severity vulnerability in Agentejo Cockpit, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-08-14.
How severe is CVE-2023-4321?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-4321 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.