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CVE-2026-28557— wpForo Forum < 2.4.16 Privilege Escalation via Role Synchronization Handler

Quick assessment

Affected
gVectors Team wpForo Forum
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin wpForo Forum 2.4.14版本存在安全漏洞，该漏洞源于缺少能力检查，可能导致经过身份验证的用户触发批量用户组重新分配。

CVSS 6.5 · Medium EPSS 0.40% · P31

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

Affected Version Matrix 2

VendorProduct Version RangeStatus
gVectors Team wpForo Forum 2.4< 2.4.16 affected
2.4.16 unaffected
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I. Basic Information for CVE-2026-28557

Vulnerability Information
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Vulnerability Title
wpForo Forum < 2.4.16 Privilege Escalation via Role Synchronization Handler
Source: CVE Program / CVE List V5
Vulnerability Description
wpForo Forum 2.4.14 contains a missing capability check vulnerability that allows authenticated users to trigger bulk wpForo usergroup reassignment via the wpforo_synch_roles AJAX handler. Attackers access the usergroups admin page, accessible to any authenticated user, to obtain a nonce, then remap all wpForo usergroups to arbitrary WordPress roles.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin wpForo Forum 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin wpForo Forum 2.4.14版本存在安全漏洞，该漏洞源于缺少能力检查，可能导致经过身份验证的用户触发批量用户组重新分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gVectors Team wpForo Forum 2.4 ~ 2.4.16 -

II. Public POCs for CVE-2026-28557

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III. Intelligence Information for CVE-2026-28557

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Vendor Advisories for CVE-2026-28557 (1)

Vendor Pages for CVE-2026-28557 (1)

Same Patch Batch · gVectors Team · 2026-02-28 · 9 CVEs total

CVE-2026-28562 8.2 HIGH wpForo Forum 2.4.14 SQL Injection via Topics ORDER BY Parameter
CVE-2026-28558 6.4 MEDIUM wpForo Forum 2.4.14 Stored XSS via SVG Avatar File Upload
CVE-2026-28561 5.5 MEDIUM wpForo Forum 2.4.14 Stored XSS via Unescaped Forum Description in Templates
CVE-2026-28560 5.5 MEDIUM wpForo Forum 2.4.14 Stored XSS via Unsafe JSON Encoding in Inline Script
CVE-2026-28556 5.4 MEDIUM wpForo Forum 2.4.14 Missing Authorization via Topic Management Form Handlers
CVE-2026-28559 5.3 MEDIUM wpForo Forum 2.4.14 Information Disclosure via Global RSS Feed
CVE-2026-28555 4.3 MEDIUM wpForo Forum 2.4.14 Missing Authorization via Topic Close AJAX Handler
CVE-2026-28554 4.3 MEDIUM wpForo Forum 2.4.14 Missing Authorization via Post Approval AJAX Handler

IV. Related Vulnerabilities

Same product: wpForo Forum
Same vendor: gVectors Team
Same weakness: CWE-862

V. Comments for CVE-2026-28557

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