SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2016-2221

Open redirect vulnerability in the wp_validate_redirect function in wp-includes/pluggable.php in WordPress before 4.4.2 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a malformed URL that triggers…

HIGH 7.4EPSS 4.45%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (4.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Open redirect vulnerability in the wp_validate_redirect function in wp-includes/pluggable.php in WordPress before 4.4.2 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a malformed URL that triggers incorrect hostname parsing, as demonstrated by an https:example.com URL.

CVSS 3.0
7.4 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
EPSS
4.45% probability · 91th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Affected
wordpress/wordpress
Source
security@debian.org
EPSS trend
0%3%5%26 October 2026: 4.45%26 October 202626 October 2026

EPSS 4.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.