Unauthenticated privilege escalation via attacker-controlled JWKS key
Published Dec 12, 2023 · Updated Feb 25, 2026
JWT validation flaws in SAP Cloud Security Services Integration Library allow remote attackers to gain arbitrary application permissions. XsuaaJkuValidator accepts an attacker-controlled jku header, retrieves the attacker's JWKS, and validates a token signed with the corresponding private key. The consuming application must expose JWT-authenticated functionality through an affected module; successful forgery grants the permissions carried in the token.
Summary
What happened
JWT validation flaws in SAP Cloud Security Services Integration Library allow remote attackers to gain arbitrary application permissions. XsuaaJkuValidator accepts an attacker-controlled jku header, retrieves the attacker's JWKS, and validates a token signed with the corresponding private key. The consuming application must expose JWT-authenticated functionality through an affected module; successful forgery grants the permissions carried in the token.
The record
- CVE
- CVE-2023-50422
- Published
- Dec 12, 2023
- Updated
- Feb 25, 2026
- Vendor
- SAP SE
- Product
- SAP Cloud Security Services Integration Library
- Classifications
- CWE-749, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 12, 2023CVE publishedPublication date reported by the CVE source.
- Feb 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 2.17.0
- Affected versionversion=3.0.0 <3.3.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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