CVE-2026-28558Network attack vector

Stored XSS via unsanitized SVG avatar upload

Published Feb 28, 2026 · Updated Feb 28, 2026

Stored XSS in gVectors Team wpForo Forum before 2.4.16 allows remote authenticated users to run scripts through crafted SVG avatars. The avatar upload path accepts SVG content containing CSS injection or JavaScript event handlers and publishes the file on the uploader's profile without neutralizing active content. Subscriber access is sufficient to store the payload; execution occurs when another user views the attacker's profile page.

CVSS severity6.4
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in gVectors Team wpForo Forum before 2.4.16 allows remote authenticated users to run scripts through crafted SVG avatars. The avatar upload path accepts SVG content containing CSS injection or JavaScript event handlers and publishes the file on the uploader's profile without neutralizing active content. Subscriber access is sufficient to store the payload; execution occurs when another user views the attacker's profile page.

The record

CVE
CVE-2026-28558
Published
Feb 28, 2026
Updated
Feb 28, 2026
Vendor
AdvancedCoding
Product
wpForo Forum
Classifications
CWE-79
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo