WP Fastest Cache < 0.9.5 - Authenticated (Subscriber+) SQL Injection
Strategic Overview
- Status
- Patched in 0.9.5
- Affected Plugin
- WP Fastest Cache – WordPress Cache Plugin
- Affected Version
< 0.9.5- CVSS
- 8.8High
- Weakness type
- CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
- CVE
CVE-2021-24869
At a glance
CVE-2021-24869 is a high-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the WP Fastest Cache WordPress plugin, affecting versions < 0.9.5. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 0.9.5; sites on affected versions should update now. Disclosed October 2021, reported by Marc-Alexandre Montpas.
Vulnerability Overview
The WP Fastest Cache plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter in versions before 0.9.5 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers subscriber-level privileges or above to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Reaching this weakness in WP Fastest Cache < 0.9.5 takes an account at Subscriber level or above. SQL injection happens when request data is concatenated into a query instead of being bound as a parameter, letting an attacker change the structure of the statement rather than just its values.
A working injection can read any table the database user can see, which on a WordPress install means user records, password hashes and session or API secrets stored in options. For WP Fastest Cache the fix is 0.9.5: builds < 0.9.5 are affected, anything from 0.9.5 onward is not.
Remediation
Update to version 0.9.5, or a newer patched version
How does WordSec protect against this?
An attacker needs Subscriber access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Fastest Cache 0.9.5 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in WP Fastest Cache – WordPress Cache Plugin
- 9.1CVE-2019-13635: WP Fastest Cache <= 0.8.9.5 Directory Traversal
CVE-2019-13635 - 8.8CVE-2021-24870: WP Fastest Cache CSRF to Stored Cross-Site Scripting
CVE-2021-24870 - 8.8CVE-2018-17584: WP Fastest Cache <= 0.8.8.5 Cross-Site Request Forgery
CVE-2018-17584 - 8.8WP Fastest Cache <= 0.8.5.9 Local File Inclusion
- 8.8WP Fastest Cache <= 0.8.5.7 Local File Inclusion
- 8.8CVE-2015-4089: WP Fastest Cache < 0.8.3.5 Multiple CSRF
CVE-2015-4089 - 8.0CVE-2020-36836: WP Fastest Cache <= 0.9.0.2 Arbitrary File Deletion
CVE-2020-36836 - 7.2CVE-2026-19760: WP Fastest Cache <= 1.5.0 Stored Cross-Site Scripting
CVE-2026-19760
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