CVE-2017-20113Public exploitNetwork attack vector

Stored script execution via unsanitized conference topic

Published Jun 29, 2022 · Updated Apr 15, 2025

Stored cross-site scripting in TrueConf Server 4.3.7 allows remote authenticated users to execute script in another user's browser. The conference-creation handler stores the topic field without properly sanitizing script-related HTML before returning it to users. A low-privilege authenticated account can plant the payload, but execution requires another user to view the stored conference data in a browser.

CVSS severity5.4
Medium
EPSS probability0.62%
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 TrueConf Server 4.3.7 allows remote authenticated users to execute script in another user's browser. The conference-creation handler stores the topic field without properly sanitizing script-related HTML before returning it to users. A low-privilege authenticated account can plant the payload, but execution requires another user to view the stored conference data in a browser.

The record

CVE
CVE-2017-20113
Published
Jun 29, 2022
Updated
Apr 15, 2025
Vendor
TrueConf
Product
TrueConf Server
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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=4.3.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TrueConf · TrueConf Serverversion=4.3.7

Published CVSS scores

3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript/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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