CVE-2021-4164

mediumpriority · track · 35EPSS 0.005 · 46 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.55% (46th) EPSS

CVSS 6.8 · medium

Is it mine?

3 products

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.07.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:Hsecondary · ENISA EU

v3.07.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:Hsecondary · security@huntr.devexploitability 2.8 · impact 4.7

v3.07.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:Hsecondary · OSV

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

The CWE weakness classes this flaw belongs to.

Products and version ranges known to be affected.

Vendor and ecosystem advisories describing this.

GHSA-wxr6-29pv-ch68calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)2022-01-21ghsa · osvUS
calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)
PYSEC-2026-621calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)2026-07-02vendor · osvUS
calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)

Other names and identifiers for this entity.

Which sources assert this record, and when.

published 2022-01-17modified 2026-06-17

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.