CVE-2018-25248Public exploitNetwork attack vector

Administrator-browser script execution via unescaped download title

Published Apr 4, 2026 · Updated Apr 4, 2026

Stored cross-site scripting in MyBB Downloads 2.0.3 allows remote authenticated users to execute scripts in an administrator's browser. The downloads.php submission path stores a member-controlled title containing HTML or JavaScript, and the administrator validation view renders it as active markup. Exploitation requires permission to create downloads and an administrator to validate the pending entry, after which the script runs in the administrator's browser context.

CVSS severity5.1
Medium
EPSS probability0.22%
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 MyBB Downloads 2.0.3 allows remote authenticated users to execute scripts in an administrator's browser. The downloads.php submission path stores a member-controlled title containing HTML or JavaScript, and the administrator validation view renders it as active markup. Exploitation requires permission to create downloads and an administrator to validate the pending entry, after which the script runs in the administrator's browser context.

The record

CVE
CVE-2018-25248
Published
Apr 4, 2026
Updated
Apr 4, 2026
Vendor
MyBB
Product
Downloads
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=2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MyBB · Downloadsversion=2.0.3

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
7.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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