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Fencer Vulns
medium 6.1

CVE-2021-24245 json

Stop Spammers < 2021.9 - Reflected Cross-Site Scripting (XSS)

published 2021-05-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11159

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.7%
EPSS 5.7% chance of exploitation in 30 days, percentile 93%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

The Stop Spammers WordPress plugin before 2021.9 did not escape user input when blocking requests (such as matching a spam word), outputting it in an attribute after sanitising it to remove HTML tags, which is not sufficient and lead to a reflected Cross-Site Scripting issue.

Patch / fix

  • trumani stop_spammers 2021.9

Timeline

  1. Published
  2. First public exploit (EDB-49880)

Exploit prediction

5.72% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49880 WordPress Plugin Stop Spammers 2021.8 - 'log' Reflected Cross-site Scripting (XSS) webapps, 2021-05-19
  • Nuclei template WordPress Stop Spammers <2021.9 - Cross-Site Scripting nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/5e7accd6-08dc-4c6e-9d19-73e2d7e97735 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/162623/WordPress-Stop-Spammers-2021.8-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

  • Trumani Stop Spammers

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.