CVE-2026-28561Network attack vector

Stored XSS via unescaped forum description output

Published Feb 28, 2026 · Updated Feb 28, 2026

Stored cross-site scripting in gVectors Team wpForo Forum before 2.4.16 allows remote authenticated users to run persistent JavaScript. Theme templates echo the administrator-controlled forum description without output escaping, preserving HTML event handlers in forum listings. Administrator privileges or a compromised administrator account are required, and the payload runs only when another user views an affected listing.

CVSS severity4.8
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in gVectors Team wpForo Forum before 2.4.16 allows remote authenticated users to run persistent JavaScript. Theme templates echo the administrator-controlled forum description without output escaping, preserving HTML event handlers in forum listings. Administrator privileges or a compromised administrator account are required, and the payload runs only when another user views an affected listing.

The record

CVE
CVE-2026-28561
Published
Feb 28, 2026
Updated
Feb 28, 2026
Vendor
AdvancedCoding
Product
wpForo Forum
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

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 privilegesadmin

What is affected?

AdvancedCoding · wpForo Forumversion=2.4 <2.4.16

Published CVSS scores

4.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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