The Fast Secure Contact Form plugin before 4.0.38 for WordPress allows fs_contact_form1[welcome] XSS.

published 2019-11-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2015-9379

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

Patch / fix

fixed in 1

fast_secure_contact_form_project fast_secure_contact_form 4.0.38

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/cybersecurityworks/Disclosed/issues/4 referenced PoC, tagged "exploit" by a source, unverified
openwall.com https://www.openwall.com/lists/oss-security/2015/10/27/2 referenced PoC, tagged "exploit" by a source, unverified
cybersecurityworks.com https://cybersecurityworks.com/zerodays/cve-2015-9539-fastsecure.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

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

WordPress rss critical rss

References

github.com /cybersecurityworks/Disclosed/issues/4
exploit, third-party-advisory
openwall.com /lists/oss-security/2015/10/27/2
exploit, mailing-list, third-party-advisory
cybersecurityworks.com /zerodays/cve-2015-9539-fastsecure.html
exploit, third-party-advisory
github.com /amansaini/fast-secure-contact-form
third-party-advisory

Sources

CVE List CVE-2015-9539
NVD CVE-2015-9539

Fencer Intel 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.

Summary