CVE-2026-28556

Name: CVE-2026-28556
Creator: NVD / NIST
Published: 2026-02-28T22:16:02.22+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2026-28556 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to move, merge, or split any forum topic via the topic_move, topic_merge, and topic_split form action handlers. Attackers with a valid form nonce can reorganize arbitrary forum content without moderator permissions, including relocating topics to private forums.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to move, merge, or split any forum topic via the topic_move, topic_merge, and topic_split form action handlers. Attackers with a valid form nonce can reorganize arbitrary forum content without moderator permissions, including relocating topics to private forums.

Metrics

CVSS 3.1

5.4/10

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

CVSS 4.0

5.3/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.22%

12.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Gvectors	Wpforo Forum	>= 2.4.0, < 2.4.16

References

https://wordpress.org/plugins/wpforo/Product
https://wordpress.org/plugins/wpforo/#developersRelease Notes
https://www.vulncheck.com/advisories/wpforo-forum-missing-authorization-via-topic-management-form-handlersThird Party Advisory

Timeline

Published: Feb 28, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28556?

How severe is CVE-2026-28556?

CVE-2026-28556 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST