PatchTheCVECVE-2021-24535: The Light Messages WordPress plugin through 1.0 is lacking CSRF check when updating it's settings, and is not
CVE-2021-24535 is a medium-severity flaw (CVSS 6.1) affecting light messages. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Light Messages WordPress plugin through 1.0 is lacking CSRF check when updating it's settings, and is not sanitising its Message Content in them (even with the unfiltered_html disallowed). As a result, an attacker could make a logged in admin update the settings to arbitrary values, and set a Cross-Site Scripting payload in the Message Content. Depending on the options set, the XSS payload can be triggered either in the backend only (in the p
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-24535?
light messages: upgrade to newer than 1.0. Exact commands for each OS are on this page.
Is CVE-2021-24535 being exploited?
CVE-2021-24535 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-24535 affect?
CVE-2021-24535 affects light messages. Severity is medium (CVSS 6.1). The Light Messages WordPress plugin through 1.0 is lacking CSRF check when updating it's settings, and is not sanitising its Message Content in them (even with the unfiltered_html disallowed). As a result, an attacker could make a logged in
How urgent is CVE-2021-24535?
Priority 35/100. Public exploit reference