CVE-2019-20441Network attack vector

Stored script execution via unsanitized API context

Published Jan 27, 2020 · Updated Aug 5, 2024

Stored XSS in WSO2 API Manager 2.6.0 allows remote authenticated users to run script in another user’s browser through API creation. The API Publisher accepts a harmful context parameter in an implement-phase POST and later renders the stored value without neutralizing script content. A high-privileged Publisher account must submit the payload, and another user must view it; protected httpOnly cookies prevent session hijacking, but the script can redirect the browser, alter the page, or retrieve browser information.

CVSS severity4.8
Medium
EPSS probability0.80%
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 WSO2 API Manager 2.6.0 allows remote authenticated users to run script in another user’s browser through API creation. The API Publisher accepts a harmful context parameter in an implement-phase POST and later renders the stored value without neutralizing script content. A high-privileged Publisher account must submit the payload, and another user must view it; protected httpOnly cookies prevent session hijacking, but the script can redirect the browser, alter the page, or retrieve browser information.

The record

CVE
CVE-2019-20441
Published
Jan 27, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8MITRECVSS:3.0/AV:N/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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