CVE-2026-28560 wpForo Forum 2.4.14 Stored XSS via Unsafe JSON Encoding in Inline Script
Attackers can inject arbitrary scripts into all visitors' browsers via forum URL data in wpForo Forum due to unsafe JSON encoding.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-28560?
CVE-2026-28560 is a medium-severity cross-site scripting vulnerability in gVectors Team wpForo Forum, published on 28 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-28560?
It affects 1 product.
Products include Gvectors Wpforo Forum.
How do I fix CVE-2026-28560?
No fix has been published for CVE-2026-28560 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-28560 being exploited?
There is no known exploitation of CVE-2026-28560 in the wild and no public exploit code.
Other vulnerabilities in gVectors Team wpForo Forum
- CVE-2024-3200 wpForo Forum <= 2.3.3 - Authenticated (Contributor+) SQL Injection
- CVE-2022-40200 WordPress wpForo Forum plugin <= 2.0.9 - Auth. Arbitrary File Upload vulnerability
- CVE-2018-16613 Privilege escalation in n/a
- CVE-2026-28562 wpForo Forum 2.4.14 SQL Injection via Topics ORDER BY Parameter
- CVE-2023-2249 Server-side request forgery in wpForo Forum
Sources
Also known as GHSA-qv3m-qhpr-9vhh.