What is CVE-2021-37760?

CVE-2021-37760 is a critical-severity vulnerability in Graylog, classified under Insertion of Sensitive Information into Log File. CVSS score: 9.8/10. Published 2021-07-31.

How severe is CVE-2021-37760?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Information disclosure in Graylog

CVE-2021-37760

A Session ID leak in the audit log in Graylog before 4.1.2 allows attackers to escalate privileges (to the access level of the leaked session ID).

Published 2021-07-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.1th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Graylog

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

www.graylog.org/post/announcing-graylog-v4-1-2 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-37760?: CVE-2021-37760 is a critical-severity vulnerability in Graylog, classified under Insertion of Sensitive Information into Log File. CVSS score: 9.8/10. Published 2021-07-31.
How severe is CVE-2021-37760?: Critical severity. CVSS v3 base score is 9.8 out of 10.