Unauthenticated privilege escalation via permissive issuer matching
Published Dec 12, 2023 · Updated Feb 25, 2026
Issuer validation bypass in SAP Cloud Security Client Go before 0.17.0 allows remote attackers to obtain arbitrary application permissions. Middleware.verifyIssuer accepts any issuer hostname ending in a trusted domain, without requiring an exact host or dot-delimited subdomain. An unauthenticated attacker must supply a token whose attacker-controlled issuer suffix-matches a configured identity domain; successful validation exposes the permissions accepted by the embedding application.
Summary
What happened
Issuer validation bypass in SAP Cloud Security Client Go before 0.17.0 allows remote attackers to obtain arbitrary application permissions. Middleware.verifyIssuer accepts any issuer hostname ending in a trusted domain, without requiring an exact host or dot-delimited subdomain. An unauthenticated attacker must supply a token whose attacker-controlled issuer suffix-matches a configured identity domain; successful validation exposes the permissions accepted by the embedding application.
The record
- CVE
- CVE-2023-50424
- Published
- Dec 12, 2023
- Updated
- Feb 25, 2026
- Vendor
- SAP SE
- Product
- Cloud Security Client Go
- 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=< 0.17.0
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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