Known vulnerabilities in WP Fastest Cache – WordPress Cache Plugin

The simplest and fastest WP Cache system

36Reported vulnerabilities

9.8Highest CVSS score

1.5.0Latest version

1,000,000+Active installs

What to do now

Update WP Fastest Cache – WordPress Cache Plugin to 1.5.1 or later. 36 of these have a fixed version available. Updating resolves them.

Plugin last updated: August 3, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2023-6063	High 7.5	73.7%	Before 1.2.2	`1.2.2`	December 4, 2023
CVE-2019-13635	Critical 9.1	44.4%	0.8.9.5 and earlier	`0.8.9.6`	July 30, 2019
CVE-2023-1938	High 8.8	8.5%	Before 1.1.5	`1.1.5`	May 30, 2023
CVE-2015-9316	Critical 9.8	3.0%	Before 0.8.4.9	`0.8.4.9`	August 14, 2019
CVE-2021-24869	High 8.8	1.2%	Before 0.9.5	`0.9.5`	January 16, 2024
CVE-2018-17584	High 8.8	0.9%	0.8.8.5 to 0.8.8.5 (inclusive)	`0.8.8.6`	April 15, 2019
CVE-2020-36836	High 8	1.4%	Before 0.9.0.3	`0.9.0.3`	October 16, 2024
CVE-2019-6726	Medium 6.5	4.3%	0.8.9.0 and earlier	`0.8.9.1`	July 29, 2019
CVE-2018-17586	Medium 6.1	1.4%	0.8.8.5 to 0.8.8.5 (inclusive)	`0.8.8.6`	April 15, 2019
CVE-2018-17585	Medium 6.1	1.4%	0.8.8.5 to 0.8.8.5 (inclusive)	`0.8.8.6`	April 15, 2019
CVE-2018-17583	Medium 6.1	1.4%	0.8.8.5 to 0.8.8.5 (inclusive)	`0.8.8.6`	April 15, 2019
CVE-2021-24870	Medium 6.1	0.3%	Before 0.9.5	`0.9.5`	January 16, 2024
CVE-2015-4089	High 8.8	1.0%	0.8.3.4 and earlier	`0.8.3.5`	September 19, 2017
WF-e8fe4aa7-13e6-48ec-afec-2888edd999f5	High 8.8	—	0.8.5.9 and earlier	`0.8.6.0`	July 13, 2016
WF-3ebe25a7-fa4d-4e3f-b969-2ff3a8388b06	High 8.8	—	0.8.5.7 and earlier	`0.8.5.8`	May 24, 2016
CVE-2024-4347	High 7.2	0.9%	0 to 1.2.6 (inclusive)	`1.2.7`	May 23, 2024
CVE-2021-20714	Medium 6.5	2.6%	Before 0.9.1.7	`0.9.1.7`	April 27, 2021
CVE-2026-19760	High 7.2	0.4%	0 to 1.5.0 (inclusive)	`1.5.1`	August 26, 2026
WF-65b3baaf-86e4-4dd2-b3eb-84c21eabdd6d	High 7.4	—	0.8.7.4 and earlier	`0.8.7.5`	February 22, 2018
WF-fcbd718b-4d7d-48a4-9db2-dd938de7c7eb	Medium 4.9	—	0.8.5.7 and earlier	`0.8.5.8`	May 23, 2016
CVE-2023-1375	Medium 4.3	0.5%	1.1.2 and earlier	`1.1.3`	June 9, 2023
CVE-2025-10476	Medium 4.3	0.2%	1.4.0 and earlier	`1.4.1`	November 26, 2025
CVE-2023-1931	Medium 4.3	0.4%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1930	Medium 4.3	0.4%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1929	Medium 4.3	0.4%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1928	Medium 4.3	0.4%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1927	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1926	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1925	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1924	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1923	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1922	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1921	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1920	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1919	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023
CVE-2023-1918	Medium 4.3	0.2%	1.1.2 and earlier	`1.1.3`	April 6, 2023

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.