CVE-2026-28555Network attack vector

Subscriber topic-state manipulation via missing permission check

Published Feb 28, 2026 · Updated Feb 28, 2026

Missing authorization in wpForo Forum 2.4 before 2.4.16 allows remote authenticated users to close or reopen arbitrary topics. The wpforo_close_ajax handler accepts a valid nonce and attacker-selected topic ID, then changes the topic state without enforcing the moderator permission required for that action. Subscriber-level access supplies the nonce; successful requests alter discussion state but do not grant broader moderator capabilities.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in wpForo Forum 2.4 before 2.4.16 allows remote authenticated users to close or reopen arbitrary topics. The wpforo_close_ajax handler accepts a valid nonce and attacker-selected topic ID, then changes the topic state without enforcing the moderator permission required for that action. Subscriber-level access supplies the nonce; successful requests alter discussion state but do not grant broader moderator capabilities.

The record

CVE
CVE-2026-28555
Published
Feb 28, 2026
Updated
Feb 28, 2026
Vendor
AdvancedCoding
Product
wpForo Forum
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4 <2.4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

AdvancedCoding · wpForo Forumversion=2.4 <2.4.16

Published CVSS scores

4.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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