wpForo Forum <= 2.4.16 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Forum Post Modification via 'guestposting' Parameter
Summary
| CVE | CVE-2026-4666 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-17 04:16:11 UTC |
| Updated | 2026-04-17 04:16:11 UTC |
| Description | The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of `extract($args, EXTR_OVERWRITE)` on user-controlled input in the `edit()` method of `classes/Posts.php` in all versions up to, and including, 2.4.16. The `post_edit` action handler in `Actions.php` passes `$_REQUEST['post']` directly to `Posts::edit()`, which calls `extract($args, EXTR_OVERWRITE)`. An attacker can inject `post[guestposting]=1` to overwrite the local `$guestposting` variable, causing the entire permission check block to be skipped. The nonce check uses a hardcoded `wpforo_verify_form` action shared across all 8 forum templates, so any user who can view any forum page obtains a valid nonce. This makes it possible for authenticated attackers, with Subscriber-level access and above, to edit the title, body, name, and email fields of any forum post, including posts in private forums, admin posts, and moderator posts. Content passes through `wpforo_kses()` which strips JavaScript but allows rich HTML. |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.000120000 probability, percentile 0.016140000 (date 2026-04-18)
Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | CNA | DECLARED | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Tomdever | WpForo Forum | affected 2.4.16 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| ti.wordfence.io/vendors/patch/1885/download | [email protected] | ti.wordfence.io | |
| plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/includes/functions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/049ffab1-677d-4112-9f1d-092ee... | [email protected] | www.wordfence.com | |
| wordpress.org/plugins/wpforo | [email protected] | wordpress.org | |
| plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Actions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Posts.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Posts.php | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Jared Reyes (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-03-23T17:52:06.000Z | Vendor Notified |
| CNA | 2026-04-16T14:05:14.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.