CVE-2020-11457Public exploitNetwork attack vector

Stored XSS via unencoded user description

Published Apr 1, 2020 · Updated Aug 4, 2024

Stored XSS in the pfSense WebGUI before 2.4.5 allows remote authenticated users to run JavaScript in another user's browser. system_usermanager_addprivs.php appends the stored descr user-profile value to the privilege page without HTML encoding. Creating a crafted user requires authenticated User Manager access, and execution requires another user to view that user's privilege page, exposing session data or enabling actions with that viewer's privileges.

CVSS severity5.4
Medium
EPSS probability9.28%
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 pfSense WebGUI before 2.4.5 allows remote authenticated users to run JavaScript in another user's browser. system_usermanager_addprivs.php appends the stored descr user-profile value to the privilege page without HTML encoding. Creating a crafted user requires authenticated User Manager access, and execution requires another user to view that user's privilege page, exposing session data or enabling actions with that viewer's privileges.

The record

CVE
CVE-2020-11457
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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