FKIE_CVE-2026-5430
Vulnerability from fkie_nvd - Published: 2026-08-06 08:16 - Updated: 2026-08-10 12:35
Severity
Summary
The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access.
Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| 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 | traffic_manager | * | |
| wso2 | traffic_manager | * | |
| wso2 | universal_gateway | * | |
| wso2 | universal_gateway | * |
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"vendor": "WSO2",
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"version": "4.5.0",
"versionType": "custom"
},
{
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"status": "affected",
"version": "4.6.0",
"versionType": "custom"
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},
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},
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"version": "4.5.0",
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"version": "4.6.0",
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},
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},
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}
]
},
{
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"product": "WSO2 Carbon API Manager Rest API Utility",
"vendor": "WSO2",
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"status": "affected",
"version": "9.20.74",
"versionType": "custom"
},
{
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"status": "affected",
"version": "9.28.116",
"versionType": "custom"
},
{
"lessThan": "9.29.120.236",
"status": "affected",
"version": "9.29.120",
"versionType": "custom"
},
{
"lessThan": "9.30.67.167",
"status": "affected",
"version": "9.30.67",
"versionType": "custom"
},
{
"lessThan": "9.31.86.158",
"status": "affected",
"version": "9.31.86",
"versionType": "custom"
},
{
"lessThan": "9.32.147.59",
"status": "affected",
"version": "9.32.147",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "9.33.106",
"versionType": "custom"
}
]
}
],
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8"
}
],
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access.\n\nSuccessful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary."
}
],
"id": "CVE-2026-5430",
"lastModified": "2026-08-10T12:35:29.103",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 10.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
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"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"type": "Secondary"
}
],
"ssvcV203": [
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"ssvcData": {
"id": "CVE-2026-5430",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-06T12:30:48.140300Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-06T08:16:33.240",
"references": [
{
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"tags": [
"Vendor Advisory"
],
"url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/"
}
],
"sourceIdentifier": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-347"
}
],
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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