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Fencer Vulns
medium 6.1

CVE-2021-24276 json

Contact Form by Supsystic < 1.7.15 - Reflected Cross-Site scripting (XSS)

published 2021-05-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11190

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
16.0%
EPSS 16.0% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

The Contact Form by Supsystic WordPress plugin before 1.7.15 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

Patch / fix

  • supsystic contact_form 1.7.15

Timeline

  1. Published
  2. First public exploit (EDB-50344)

Exploit prediction

16.04% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50344 WordPress Plugin Contact Form 1.7.14 - Reflected Cross-Site Scripting (XSS) webapps, 2021-09-28
  • Nuclei template WordPress Supsystic Contact Form <1.7.15 - Cross-Site Scripting nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/1301123c-5e63-432a-ab90-3221ca532d9c referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/164308/WordPress-Contact-Form-1.7.14-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Supsystic Contact Form by Supsystic

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.