What is CVE-2021-43156?

CVE-2021-43156 is a medium-severity vulnerability in Projectworlds Online Book Store Project In PHP, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-12-22.

How severe is CVE-2021-43156?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CSRF in Projectworlds Online Book Store Project In PHP

CVE-2021-43156

In ProjectWorlds Online Book Store PHP 1.0 a CSRF vulnerability in admin_delete.php allows a remote attacker to delete any book.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Projectworlds Online Book Store Project In PHP — versions 1.0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/projectworldsofficial/online-book-store-project-in-php/issues/19 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-43156?: CVE-2021-43156 is a medium-severity vulnerability in Projectworlds Online Book Store Project In PHP, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-12-22.
How severe is CVE-2021-43156?: Medium severity. CVSS v3 base score is 6.5 out of 10.