wpForo Forum <= 2.4.16 — Missing Authorization to Authenticated (Subscriber+) Arbitrary Forum Post Modification via 'guestposting' Parameter
CVE-2026-4666Published · Updated Action summary
Affected: ≤2.4.16Update to 3.0.0 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:HIntegrity- High
A:NAvailability- None
- Weakness
- CWE-862 Missing Authorization
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
wpForo Forum wpforo
- Affected≤ 2.4.16
- Patched in3.0.0
Update to 3.0.0 or newer.
You are affected if you run ≤ 2.4.16. Version 3.0.0 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under wpForo Forum.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 3.0.0, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch wpForo Forum to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Jared Reyes.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in wpForo Forum
All 59| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.5 | Authenticated (Subscriber+) Privilege Escalation to 'data[secondary_groupids]' CSV Parameter ≤3.2.2Update to 3.2.3 | CVE-2026-119164 | |
| High7.5 | Unauthenticated SQL Injection via 'data' Parameter ≤3.2.1Update to 3.2.2 | CVE-2026-95870 | |
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting via Reply Body in Moderation Forms ≤3.2.2Update to 3.2.3 | CVE-2026-120532 | |
| High7.5 | Unauthenticated SQL Injection via 'href[locale]' Parameter ≤3.2.2Update to 3.2.3 | CVE-2026-119155 | |
| Medium6.5 | Authenticated (Subscriber+) Arbitrary File Deletion via Path Traversal via 'theme' Parameter ≤3.2.2Update to 3.2.3 | CVE-2026-110004 |
- High7.5Authenticated (Subscriber+) Privilege Escalation to 'data[secondary_groupids]' CSV Parameter
≤3.2.2Update to 3.2.3
- High7.5Unauthenticated SQL Injection via 'data' Parameter
≤3.2.1Update to 3.2.2
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via Reply Body in Moderation Forms
≤3.2.2Update to 3.2.3
- High7.5Unauthenticated SQL Injection via 'href[locale]' Parameter
≤3.2.2Update to 3.2.3
- Medium6.5Authenticated (Subscriber+) Arbitrary File Deletion via Path Traversal via 'theme' Parameter
≤3.2.2Update to 3.2.3
Same weakness (Missing Authorization)
All Missing Authorization| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 6.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.