CVE-2019-20437Public exploitNetwork attack vector

Stored XSS via unencoded claim dialect URI

Published Jan 27, 2020 · Updated Aug 5, 2024

Stored XSS in WSO2 API Manager 2.6.0, IS as Key Manager 5.7.0, and Identity Server 5.8.0 allows remote authenticated users to run script. A custom claim-dialect URI is stored without safe output encoding and inserted into the advanced claim configuration, causing its payload to execute when Add Claim is selected. Exploitation requires management-console privileges to modify identity-provider configurations and can expose browser data or alter the console UI.

CVSS severity6.1
Medium
EPSS probability1.28%
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 WSO2 API Manager 2.6.0, IS as Key Manager 5.7.0, and Identity Server 5.8.0 allows remote authenticated users to run script. A custom claim-dialect URI is stored without safe output encoding and inserted into the advanced claim configuration, causing its payload to execute when Add Claim is selected. Exploitation requires management-console privileges to modify identity-provider configurations and can expose browser data or alter the console UI.

The record

CVE
CVE-2019-20437
Published
Jan 27, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
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

6.1WSO2CVSS:3.0/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
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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 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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