Medium severity · published Feb 28, 2026
CVE-2026-28560
wpForo Forum 2.4.14 Stored XSS via Unsafe JSON Encoding in Inline Script
4.8
CVSS
0.3%
EPSS
No
On KEV
Description
wpForo Forum 2.4.14 contains a stored cross-site scripting vulnerability that allows script injection via forum URL data output into an inline script block using json_encode without the JSON_HEX_TAG flag. Attackers set a forum slug containing a closing script tag or unescaped single quote to break out of the JavaScript string context and execute arbitrary script in all visitors' browsers.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WF
wpForo Forum · gVectors Team
2.4 before 2.4.16 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28560
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28560
Product
https://wordpress.org/plugins/wpforo/
Release Notes
https://wordpress.org/plugins/wpforo/#developers
Third Party Advisory
https://www.vulncheck.com/advisories/wpforo-forum-stored-xss-via-unsafe-json-encoding-in-inline-script
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