CVE-2026-59335
Case-Sensitive Authorization Check Bypass via Identity Zone ID Case Manipulation Leads to Full UAA Compromise
Description
Improper handling of case sensitivity (CWE-178) in the identity zone authorization check in the Identity Zone Endpoint in Cloud Foundry UAA allows a remote authenticated attacker holding only the zones.write authority to bypass the intended restriction that this authority does not grant access to the privileged uaa (system) identity zone, by referring to the zone identifier in a non-lowercase form (e.g. UAA) in the request path and body. The authorization layer performs a case-sensitive comparison against the system zone identifier, while the underlying MySQL persistence layer resolves identifiers case-insensitively under its default collation, so the request is authorized incorrectly and is then resolved against the real system zone record. This allows the attacker to overwrite the system zone's JWT signing key with attacker-controlled key material, forge JWTs claiming the admin client and administrator scopes, and fully compromise UAA and any Cloud Foundry deployment that trusts it. This issue only affects UAA deployments backed by MySQL using its default collation; PostgreSQL and HSQLDB backends are not affected.
INFO
Published Date :
Aug. 25, 2026, 11:16 a.m.
Last Modified :
Sept. 28, 2026, 11:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | dcf2e128-44bd-42ed-91e8-88f912c1401d | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Ensure case-insensitive comparison for zone identifiers.
- Update UAA to apply proper authorization checks.
- Apply relevant security patches for UAA.
- Review MySQL collation settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59335.
| URL | Resource |
|---|---|
| https://www.cloudfoundry.org/blog/cve-2026-59335-uaa-case-insensitive-check-bypass/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59335 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59335
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59335 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59335 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Sep. 28, 2026
Action Type Old Value New Value Added Translation Title: UAA y cf-deployment de Cloud Foundry, Description: Manejo inadecuado de la distinción entre mayúsculas y minúsculas (CWE-178) en la verificación de autorización de la zona de identidad en el Endpoint de Zona de Identidad en Cloud Foundry UAA permite a un atacante remoto autenticado que posee únicamente la autoridad zones.write eludir la restricción prevista de que esta autoridad no otorga acceso a la zona de identidad privilegiada uaa (del sistema), al referirse al identificador de la zona en una forma que no sea minúscula (p. ej., UAA) en la ruta y el cuerpo de la solicitud. La capa de autorización realiza una comparación que distingue entre mayúsculas y minúsculas contra el identificador de la zona del sistema, mientras que la capa de persistencia subyacente de MySQL resuelve los identificadores sin distinguir entre mayúsculas y minúsculas bajo su intercalación predeterminada, por lo que la solicitud se autoriza incorrectamente y luego se resuelve contra el registro real de la zona del sistema. Esto permite al atacante sobrescribir la clave de firma JWT de la zona del sistema con material de clave controlado por el atacante, forjar JWTs que reclaman el cliente admin y los alcances administrator, y comprometer completamente UAA y cualquier despliegue de Cloud Foundry que confíe en él. Este problema solo afecta a los despliegues de UAA respaldados por MySQL que utilizan su intercalación predeterminada; los backends de PostgreSQL y HSQLDB no se ven afectados. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 25, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-59335', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-25T13:08:56.301972Z'} -
New CVE Received by [email protected]
Aug. 25, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cloud Foundry', 'product': 'UAA', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '78.16.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '78.16.0', 'versionType': 'semver'}], 'defaultStatus': 'unknown'}, {'vendor': 'Cloud Foundry', 'product': 'cf-deployment', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '57.0.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '57.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unknown'}] Added Description Improper handling of case sensitivity (CWE-178) in the identity zone authorization check in the Identity Zone Endpoint in Cloud Foundry UAA allows a remote authenticated attacker holding only the zones.write authority to bypass the intended restriction that this authority does not grant access to the privileged uaa (system) identity zone, by referring to the zone identifier in a non-lowercase form (e.g. UAA) in the request path and body. The authorization layer performs a case-sensitive comparison against the system zone identifier, while the underlying MySQL persistence layer resolves identifiers case-insensitively under its default collation, so the request is authorized incorrectly and is then resolved against the real system zone record. This allows the attacker to overwrite the system zone's JWT signing key with attacker-controlled key material, forge JWTs claiming the admin client and administrator scopes, and fully compromise UAA and any Cloud Foundry deployment that trusts it. This issue only affects UAA deployments backed by MySQL using its default collation; PostgreSQL and HSQLDB backends are not affected. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N Added CWE CWE-178 Added Reference https://www.cloudfoundry.org/blog/cve-2026-59335-uaa-case-insensitive-check-bypass/