CVE-2018-25249Public exploitNetwork attack vector

Authenticated browser script execution via unencoded score comments

Published Apr 4, 2026 · Updated Apr 4, 2026

Stored XSS in the MyBB Arcade plugin 1.3 allows remote authenticated users to execute scripts in other users' browsers through score comments. In arcade.php, the edit path passes $score['comment'] into the arcade_edit template without HTML encoding it before template evaluation. An account able to play a game and add a score comment can store a payload, but script execution requires another user to view or edit that comment.

CVSS severity5.1
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the MyBB Arcade plugin 1.3 allows remote authenticated users to execute scripts in other users' browsers through score comments. In arcade.php, the edit path passes $score['comment'] into the arcade_edit template without HTML encoding it before template evaluation. An account able to play a game and add a score comment can store a payload, but script execution requires another user to view or edit that comment.

The record

CVE
CVE-2018-25249
Published
Apr 4, 2026
Updated
Apr 4, 2026
Vendor
MyBB
Product
My Arcade
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 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=1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MyBB · My Arcadeversion=1.3

Published CVSS scores

6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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