What is CVE-2020-12627?

CVE-2020-12627 is a critical-severity vulnerability in Janeczku Calibre-Web, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2020-05-04.

How severe is CVE-2020-12627?

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

Vulnerability in Janeczku Calibre-Web

CVE-2020-12627

Calibre-Web 0.6.6 allows authentication bypass because of the 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT' hardcoded secret key.

Published 2020-05-04 · 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: 0.014 (70.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Janeczku Calibre-Web — versions 0.6.6

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

github.com/janeczku/calibre-web/pull/1337 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-12627?: CVE-2020-12627 is a critical-severity vulnerability in Janeczku Calibre-Web, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2020-05-04.
How severe is CVE-2020-12627?: Critical severity. CVSS v3 base score is 9.8 out of 10.