PatchTheCVECVE-2021-40921: Cross-site scripting (XSS) vulnerability in _contactform.inc.php in Detector 0.8.5 and below version allows re
CVE-2021-40921 is a medium-severity flaw (CVSS 6.1) affecting detector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Cross-site scripting (XSS) vulnerability in _contactform.inc.php in Detector 0.8.5 and below version allows remote attackers to inject arbitrary web script or HTML via the cid parameter.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.7% (top 46%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-10-01 |
| 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-2021-40921?
detector: upgrade to newer than 0.8.5. Exact commands for each OS are on this page.
Is CVE-2021-40921 being exploited?
CVE-2021-40921 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-2021-40921 affect?
CVE-2021-40921 affects detector. Severity is medium (CVSS 6.1). Cross-site scripting (XSS) vulnerability in _contactform.inc.php in Detector 0.8.5 and below version allows remote attackers to inject arbitrary web script or HTML via the cid parameter.
How urgent is CVE-2021-40921?
Priority 40/100. Public exploit reference