CVE-2020-19950Public exploitNetwork attack vector

Stored XSS via unescaped banner URL

Published Sep 23, 2021 · Updated Aug 4, 2024

Cross-site scripting in YzmCMS 5.3 allows remote authenticated users to execute arbitrary web scripts via the /banner/add.html endpoint. The banner creation handler accepts a user-supplied URL such as a javascript: URI and stores it without neutralization, so generated banner links execute attacker script when opened. Administrative login and victim interaction are required; successful exploitation runs script in a user's browser and can alter page content or access data available to that session.

CVSS severity4.8
Medium
EPSS probability0.59%
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 YzmCMS 5.3 allows remote authenticated users to execute arbitrary web scripts via the /banner/add.html endpoint. The banner creation handler accepts a user-supplied URL such as a javascript: URI and stores it without neutralization, so generated banner links execute attacker script when opened. Administrative login and victim interaction are required; successful exploitation runs script in a user's browser and can alter page content or access data available to that session.

The record

CVE
CVE-2020-19950
Published
Sep 23, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE 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

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV: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.

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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')

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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