PatchTheCVECVE-2021-42549: Insufficient Input Validation in the search functionality of Wordpress plugin Lets-Box prior to 1.15.3 allows
CVE-2021-42549 is a medium-severity flaw (CVSS 4.7) affecting lets-box. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Insufficient Input Validation in the search functionality of Wordpress plugin Lets-Box prior to 1.15.3 allows unauthenticated user to craft a reflected Cross-Site Scripting attack.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.7 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.8% (top 45%) |
| 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-2021-42549?
lets-box: upgrade to 1.15.3. Exact commands for each OS are on this page.
Is CVE-2021-42549 being exploited?
CVE-2021-42549 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-2021-42549 affect?
CVE-2021-42549 affects lets-box. Severity is medium (CVSS 4.7). Insufficient Input Validation in the search functionality of Wordpress plugin Lets-Box prior to 1.15.3 allows unauthenticated user to craft a reflected Cross-Site Scripting attack.
How urgent is CVE-2021-42549?
Priority 30/100. No elevated risk signals yet.