What is the CVSS score of CVE-2026-28560?

CVE-2026-28560 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Wpforo Forum are affected by CVE-2026-28560?

Organizations using wpForo Forum 2.4.14 should be aware of moderate risk from CVE-2026-28560, a cross-site scripting vulnerability rated CVSS 5.5.

How to fix or mitigate CVE-2026-28560?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Wpforo Forum CVE-2026-28560

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-28 disclosure@vulncheck.com

XSS Wpforo Forum

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 28, 2026 - 22:16 nvd

MEDIUM 5.5

DescriptionCVE.org

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.

AnalysisAI

Stored XSS in wpForo Forum 2.4.14 allows authenticated administrators to inject malicious scripts into forum slugs that execute in all visitors' browsers due to improper JSON encoding. An attacker with high-level privileges can craft a forum URL containing unescaped characters to break out of JavaScript context and achieve arbitrary script execution. No patch is currently available for this vulnerability.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Wpforo Forum. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.