CVE-2020-1949Public exploitNetwork attack vector

Reflected XSS via unescaped URL selector

Published Apr 1, 2020 · Updated Aug 4, 2024

Reflected XSS in Apache Sling CMS App 0.14.0 and earlier allows remote attackers to execute script in an administrator's browser. Administrative-console scripts insert the URL-derived Sling Selector into generated navigation elements without property escaping. An administrator must open the crafted administrative page, after which the injected script runs in that user's browser context and can read or alter data available to the console.

CVSS severity6.1
Medium
EPSS probability1.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Apache Sling CMS App 0.14.0 and earlier allows remote attackers to execute script in an administrator's browser. Administrative-console scripts insert the URL-derived Sling Selector into generated navigation elements without property escaping. An administrator must open the crafted administrative page, after which the injected script runs in that user's browser context and can read or alter data available to the console.

The record

CVE
CVE-2020-1949
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Sling CMS App
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache Sling CMS 0.14.0 and previous releases

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Sling CMS Appversion=Apache Sling CMS 0.14.0 and previous releases

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV: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-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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