PatchTheCVECVE-2021-24587: The Splash Header WordPress plugin before 1.20.8 doesn't sanitise and escape some of its settings while output
CVE-2021-24587 is a medium-severity flaw (CVSS 5.4) affecting splash header. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Splash Header WordPress plugin before 1.20.8 doesn't sanitise and escape some of its settings while outputting them in the admin dashboard, leading to an authenticated Stored Cross-Site Scripting issue.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-09-20 |
| Last modified | 2026-06-17 |
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-2021-24587?
splash header: upgrade to 1.20.8. Exact commands for each OS are on this page.
Is CVE-2021-24587 being exploited?
CVE-2021-24587 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-2021-24587 affect?
CVE-2021-24587 affects splash header. Severity is medium (CVSS 5.4). The Splash Header WordPress plugin before 1.20.8 doesn't sanitise and escape some of its settings while outputting them in the admin dashboard, leading to an authenticated Stored Cross-Site Scripting issue.
How urgent is CVE-2021-24587?
Priority 36/100. Public exploit reference