CVE-2013-4395Public exploitNetwork attack vector

Authenticated script execution via unencoded forum inputs

Published Feb 12, 2020 · Updated Aug 6, 2024

Cross-site scripting in Simple Machines Forum through 2.0.5 allows remote authenticated users to inject scripts through forum inputs. ManageServer.php and the index.php administration and private-message actions accept crafted board_name, desc, and sa values that are rendered or stored as active markup. Administrative routes require an administrator session, and a session token blocks the published cross-origin board-creation attempt; successful injection runs script in a viewer's browser session.

CVSS severity6.1
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Simple Machines Forum through 2.0.5 allows remote authenticated users to inject scripts through forum inputs. ManageServer.php and the index.php administration and private-message actions accept crafted board_name, desc, and sa values that are rendered or stored as active markup. Administrative routes require an administrator session, and a session token blocks the published cross-origin board-creation attempt; successful injection runs script in a viewer's browser session.

The record

CVE
CVE-2013-4395
Published
Feb 12, 2020
Updated
Aug 6, 2024
Vendor
Simple Machines
Product
Simple Machines Forum
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record 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=through 2.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Simple Machines · Simple Machines Forumversion=through 2.0.5

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
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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