CVE-2021-24963: LiteSpeed Cache < 4.4.4 - Admin+ Reflected Cross-Site Scripting

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-01-03 · updated 2026-06-17
Weakness: CWE-79

Description

The LiteSpeed Cache WordPress plugin before 4.4.4 does not escape the qc_res parameter before outputting it back in the JS code of an admin page, leading to a Reflected Cross-Site Scripting

Affected products

LiteSpeed Technologies LiteSpeed Cache: before 4.4.4 — fixed in 4.4.4

How to fix

Upgrade to a fixed version: LiteSpeed Technologies LiteSpeed Cache 4.4.4. Check the vendor advisory for mitigations.

References

https://plugins.trac.wordpress.org/changeset/2634373
https://wpscan.com/vulnerability/7f8b4275-7586-4e04-afd9-d12bdab6ba9b
https://plugins.trac.wordpress.org/changeset/2634373
https://wpscan.com/vulnerability/7f8b4275-7586-4e04-afd9-d12bdab6ba9b

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