What is CVE-2021-37743?

CVE-2021-37743 is a medium-severity vulnerability in Misp, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-30.

How severe is CVE-2021-37743?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Misp

CVE-2021-37743

app/View/GalaxyElements/ajax/index.ctp in MISP 2.4.147 allows Stored XSS when viewing galaxy cluster elements in JSON format.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-30 · last modified 2026-06-22.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Misp — versions 2.4.147
Misp-Project Misp — versions 2.4.147

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/MISP/MISP/commit/f318f7c0ddac7dfd2b1f246fd8f488d9dfc3a4bf (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-37743?: CVE-2021-37743 is a medium-severity vulnerability in Misp, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-30.
How severe is CVE-2021-37743?: Medium severity. CVSS v3 base score is 5.4 out of 10.