The throttling event handling mechanism in multiple WSO2 products accepts user-supplied JSON payloads without sufficient validation of their structure and content. This allows an unauthenticated remote attacker to inject malicious JSON data that can lead to a persistent denial of service condition.

Successful exploitation of this vulnerability can disrupt the API Gateway, preventing legitimate API traffic from being processed and impacting complete service availability. The denial of service is persistent, requiring manual intervention to restore normal operations.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
WSO2 WSO2 Universal Gateway unaffected
Version Status Constraints
4.5.0 affected < 4.5.0.54
4.6.0 affected < 4.6.0.18
4.7.0 affected < 4.7.0.2
WSO2 WSO2 Traffic Manager unaffected
Version Status Constraints
4.5.0 affected < 4.5.0.53
4.6.0 affected < 4.6.0.18
4.7.0 affected < 4.7.0.2
WSO2 WSO2 API Control Plane unaffected
Version Status Constraints
4.5.0 affected < 4.5.0.55
4.6.0 affected < 4.6.0.19
4.7.0 affected < 4.7.0.2
WSO2 WSO2 API Manager unaffected
Version Status Constraints
0 unknown < 3.2.0
3.2.0 affected < 3.2.0.470
3.2.1 affected < 3.2.1.89
4.0.0 affected < 4.0.0.390
4.1.0 affected < 4.1.0.254
4.2.0 affected < 4.2.0.194
4.3.0 affected < 4.3.0.105
4.4.0 affected < 4.4.0.69
4.5.0 affected < 4.5.0.54
4.6.0 affected < 4.6.0.18
4.7.0 affected < 4.7.0.2

No data.

No data.

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Vendors Products
Wso2 Subscribe
Wso2 Api Control Plane Subscribe
Wso2 Api Manager Subscribe
Wso2 Traffic Manager Subscribe
Wso2 Universal Gateway Subscribe

Project Subscriptions

Vendors Products
Wso2 Subscribe
Wso2 Api Control Plane Subscribe
Wso2 Api Manager Subscribe
Wso2 Traffic Manager Subscribe
Wso2 Universal Gateway Subscribe
Advisories

No advisories yet.

Fixes

Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5236/#solution

Workaround

No workaround given by the vendor.

References
Link Providers
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5236/ cve-icon
History

Mon, 06 Jul 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 06 Jul 2026 10:30:00 +0000

Type Values Removed Values Added
Description The throttling event handling mechanism in multiple WSO2 products accepts user-supplied JSON payloads without sufficient validation of their structure and content. This allows an unauthenticated remote attacker to inject malicious JSON data that can lead to a persistent denial of service condition. Successful exploitation of this vulnerability can disrupt the API Gateway, preventing legitimate API traffic from being processed and impacting complete service availability. The denial of service is persistent, requiring manual intervention to restore normal operations.
Title Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
First Time appeared Wso2
Wso2 wso2 Api Control Plane
Wso2 wso2 Api Manager
Wso2 wso2 Traffic Manager
Wso2 wso2 Universal Gateway
Weaknesses CWE-707
CPEs cpe:2.3:a:wso2:wso2_api_control_plane:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:wso2_traffic_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:wso2_universal_gateway:*:*:*:*:*:*:*:*
Vendors & Products Wso2
Wso2 wso2 Api Control Plane
Wso2 wso2 Api Manager
Wso2 wso2 Traffic Manager
Wso2 wso2 Universal Gateway
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: WSO2

Published:

Updated: 2026-07-06T11:03:48.847Z

Reserved: 2026-03-16T05:47:35.673Z

Link: CVE-2026-4249

cve-icon Vulnrichment

Updated: 2026-07-06T11:03:28.003Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-06T11:30:04Z

Weaknesses