PatchTheCVECVE-2021-24817: The Ultimate NoFollow WordPress plugin through 1.4.8 does not sanitise and escape the href attribute of its sh
CVE-2021-24817 is a medium-severity flaw (CVSS 5.4) affecting ultimate nofollow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Ultimate NoFollow WordPress plugin through 1.4.8 does not sanitise and escape the href attribute of its shortcodes, allowing users with a role as low as contributor to perform Cross-Site Scripting attacks
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 | 2021-12-13 |
| 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-2021-24817?
ultimate nofollow: upgrade to newer than 1.4.8. Exact commands for each OS are on this page.
Is CVE-2021-24817 being exploited?
CVE-2021-24817 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-2021-24817 affect?
CVE-2021-24817 affects ultimate nofollow. Severity is medium (CVSS 5.4). The Ultimate NoFollow WordPress plugin through 1.4.8 does not sanitise and escape the href attribute of its shortcodes, allowing users with a role as low as contributor to perform Cross-Site Scripting attacks
How urgent is CVE-2021-24817?
Priority 36/100. Public exploit reference