How severe is CVE-2021-43155?

CVE-2021-43155 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43155?

CVE-2021-43155 affects Projectworlds Online Book Store Project In Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43155?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-43155 published?

CVE-2021-43155 was published on 2021-12-22 and last updated on 2026-06-17.

CVE-2021-43155

CVE-2021-43155 is a critical-severity vulnerability in Projectworlds Online Book Store Project In Php with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Projectworlds Online Book Store Project In Php
Published: 2021-12-22
Last modified: 2026-06-17

Description

Projectsworlds Online Book Store PHP v1.0 is vulnerable to SQL injection via the "bookisbn" parameter in cart.php.

Frequently asked questions

What is CVE-2021-43155?: Projectsworlds Online Book Store PHP v1.0 is vulnerable to SQL injection via the "bookisbn" parameter in cart.php.
How severe is CVE-2021-43155?: CVE-2021-43155 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43155?: CVE-2021-43155 affects Projectworlds Online Book Store Project In Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43155?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-43155 published?: CVE-2021-43155 was published on 2021-12-22 and last updated on 2026-06-17.

References

https://github.com/projectworldsofficial/online-book-store-project-in-php/issues/18

Affected products (1)

cpe:2.3:a:projectworlds:online_book_store_project_in_php:1.0:*:*:*:*:*:*:*

More vulnerabilities in Projectworlds Online Book Store Project In Php

CVE-2020-19114 — Critical (CVSS 9.8): SQL Injection vulnerability in Online Book Store v1.0 via the publisher parameter to edit_book.php, which could let a…
CVE-2020-19113 — Critical (CVSS 9.8): Arbitrary File Upload vulnerability in Online Book Store v1.0 in admin_add.php, which may lead to remote code execution.
CVE-2020-19112 — Critical (CVSS 9.8): SQL Injection vulnerability in Online Book Store v1.0 via the bookisbn parameter to admin_delete.php, which could let a…
CVE-2020-19111 — Critical (CVSS 9.8): Incorrect Access Control vulnerability in Online Book Store v1.0 via admin_verify.php, which could let a remote…
CVE-2020-19110 — Critical (CVSS 9.8): SQL Injection vulnerability in Online Book Store v1.0 via the bookisbn parameter to book.php parameter, which could let…
CVE-2020-19109 — Critical (CVSS 9.8): SQL Injection vulnerability in Online Book Store v1.0 via the bookisbn parameter to admin_edit.php, which could let a…

All CVEs affecting Projectworlds Online Book Store Project In Php →

Other CWE-89 (SQL Injection) vulnerabilities

CVE-2026-54350 — Critical (CVSS 10.0): Budibase is an open-source low-code platform. Prior to 3.39.12, an unauthenticated visitor of any published Budibase…
CVE-2026-8054 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in the Publish Audit API endpoints…
CVE-2026-42287 — Critical (CVSS 10.0): Emlog is an open source website building system. Prior to version 2.6.11, direct SQL injection in article creation and…
CVE-2026-3325 — Critical (CVSS 10.0): SQL injection (SQLi) in MegaCMS v12.0.0, specifically in the “id_territorio” parameter of the…
CVE-2025-10878 — Critical (CVSS 10.0): A SQL injection vulnerability exists in the login functionality of Fikir Odalari AdminPando 1.0.1 before 2026-01-26.…
CVE-2025-57792 — Critical (CVSS 10.0): Explorance Blue versions prior to 8.14.9 contain a SQL injection vulnerability caused by insufficient validation of…

Browse all CWE-89 (SQL Injection) vulnerabilities →