FKIE_CVE-2026-75509
Vulnerability from fkie_nvd - Published: 2026-08-24 20:17 - Updated: 2026-10-12 15:10
Severity
Summary
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass an intended equality check and enabling issuer-validation bypass. This issue is fixed in version 1.7.3.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "joserfc",
"vendor": "authlib",
"versions": [
{
"status": "affected",
"version": "\u003c 1.7.3"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass an intended equality check and enabling issuer-validation bypass. This issue is fixed in version 1.7.3."
},
{
"lang": "es",
"value": "joserfc es una biblioteca de Python que proporciona una implementaci\u00f3n de varios est\u00e1ndares de Firma y Cifrado de Objetos JSON (JOSE). Antes de la versi\u00f3n 1.7.3, JWTClaimsRegistry aplica la coincidencia de membres\u00eda a las reclamaciones iss y sub con valores de lista, permitiendo que un iss con valor de matriz que contiene el emisor esperado pase una verificaci\u00f3n de igualdad prevista y posibilitando la omisi\u00f3n de la validaci\u00f3n del emisor. Este problema se corrige en la versi\u00f3n 1.7.3."
}
],
"id": "CVE-2026-75509",
"lastModified": "2026-10-12T15:10:00.207",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 4.2,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-75509",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-25T16:38:57.782770Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-24T20:17:19.183",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/authlib/joserfc/commit/76ee6a59bf5773c0af00b99076c5e199031f97f1"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-290"
},
{
"lang": "en",
"value": "CWE-345"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Sightings
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|---|
Nomenclature
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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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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