CVE-2026-4249

HIGH
Published Jul 6, 2026 Modified Jul 9, 2026 CWE-707

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.

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CVSS v3.1 Score

8.6
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0034
Probability of exploitation
0.26%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-707 CWE-707

Affected Products

Vendor Product
wso2 api_control_plane
wso2 api_control_plane
wso2 api_manager
wso2 api_manager
wso2 api_manager
wso2 api_manager
wso2 api_manager
wso2 api_manager
wso2 api_manager
wso2 traffic_manager
wso2 traffic_manager
wso2 universal_gateway
wso2 universal_gateway

References

Frequently Asked Questions

What is CVE-2026-4249? +
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. It has a CVSS v3.1 base score of 8.6 (HIGH).
How severe is CVE-2026-4249? +
CVE-2026-4249 has a CVSS v3.1 score of 8.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0034, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-4249? +
CVE-2026-4249 affects products from wso2, specifically: api_control_plane, api_manager, traffic_manager, universal_gateway. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-4249? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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