CVE-2017-20057Public exploitNetwork attack vector

Stored cross-site scripting via unencoded username

Published Jun 20, 2022 · Updated Apr 15, 2025

Stored cross-site scripting in Elefant CMS 1.3.12-RC allows remote attackers to execute script in an administrator's browser. The administration backend echoes a stored username into user-edit and version-history pages without output encoding. Default-open registration lets an attacker create the account and payload, but an administrator must view an affected page to trigger it.

CVSS severity4.3
Medium
EPSS probability0.58%
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 Elefant CMS 1.3.12-RC allows remote attackers to execute script in an administrator's browser. The administration backend echoes a stored username into user-edit and version-history pages without output encoding. Default-open registration lets an attacker create the account and payload, but an administrator must view an affected page to trigger it.

The record

CVE
CVE-2017-20057
Published
Jun 20, 2022
Updated
Apr 15, 2025
Vendor
HASOMED GmbH
Product
Elefant
Classifications
CWE-80, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 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=1.3.12-RC

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HASOMED GmbH · Elefantversion=1.3.12-RC

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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