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CVE-2026-4249· NVD / CVE Program· CNA WSO2

Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.55% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.6 · v3.1—No exploit No fix recorded
Published
Jul 6, 2026
Updated
Jul 9, 2026
EPSS
0.5% · 45th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · WSO2
8.6
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-4249

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
wso2api control plane
wso2api manager
wso2traffic manager
wso2universal gateway

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • wso2 api control plane4.5.0 and later · before 4.5.0.55
  • wso2 api control plane4.6.0 and later · before 4.6.0.19
  • wso2 api manager4.0.0 and later · before 4.0.0.390
  • wso2 api manager4.1.0 and later · before 4.1.0.254
  • wso2 api manager4.2.0 and later · before 4.2.0.194
  • wso2 api manager4.3.0 and later · before 4.3.0.105
  • wso2 api manager4.4.0 and later · before 4.4.0.69
  • wso2 api manager4.5.0 and later · before 4.5.0.54
  • wso2 api manager4.6.0 and later · before 4.6.0.18
  • wso2 traffic manager4.5.0 and later · before 4.5.0.53
  • wso2 traffic manager4.6.0 and later · before 4.6.0.18
  • wso2 universal gateway4.5.0 and later · before 4.5.0.54
  • wso2 universal gateway4.6.0 and later · before 4.6.0.18

Versions reported by the vendor

Affected version ranges reported by the assigning authority (WSO2). Independent of NVD's CPE analysis and usually ahead of it.

  • WSO2 WSO2 API Control Plane

    • 4.5.0 and later · before 4.5.0.55affected
    • 4.6.0 and later · before 4.6.0.19affected
    • 4.7.0 and later · before 4.7.0.2affected

  • WSO2 WSO2 API Manager

    • before 3.2.0unknown
    • 3.2.0 and later · before 3.2.0.470affected
    • 3.2.1 and later · before 3.2.1.89affected
    • 4.0.0 and later · before 4.0.0.390affected
    • 4.1.0 and later · before 4.1.0.254affected
    • 4.2.0 and later · before 4.2.0.194affected
    • 4.3.0 and later · before 4.3.0.105affected
    • 4.4.0 and later · before 4.4.0.69affected
    • 4.5.0 and later · before 4.5.0.54affected
    • 4.6.0 and later · before 4.6.0.18affected

  • WSO2 WSO2 Traffic Manager

    • 4.5.0 and later · before 4.5.0.53affected
    • 4.6.0 and later · before 4.6.0.18affected
    • 4.7.0 and later · before 4.7.0.2affected

  • WSO2 WSO2 Universal Gateway

    • 4.5.0 and later · before 4.5.0.54affected
    • 4.6.0 and later · before 4.6.0.18affected
    • 4.7.0 and later · before 4.7.0.2affected

Same product

wso2: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-5430Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account TakeoverKEV
    70This week
  • CVE-2026-1728Privilege Escalation via System REST APIs in Multiple WSO2 Products Permits Admin Account Takeover
    39Monitor
  • CVE-2025-9312Improper Certificate-Based Authentication Enforcement in Multiple WSO2 Products
    39Monitor
  • CVE-2025-9152Improper Privilege Management in Multiple WSO2 API Manager via keymanager-operations DCR Endpoint
    39Monitor
  • CVE-2025-10611Potential Broken Access Control in Multiple WSO2 Products via System REST APIs
    39Monitor
  • CVE-2025-15039Account Takeover via Conditional Authentication Script Logic in Multiple WSO2 Products
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-707 · Improper Neutralization

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records