GCVE-1988-2026-0055
Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-11 11:37
VLAI
EPSS
VEX
Title
Security advisory: multiple vulnerabilities including JWT forgery / authentication bypass, Pre-authentication SYSTEM RCE in CIRCUTOR PowerStudio SCADA WAVE 24.11.6.0 (CIRCUTOR S.A.)
Summary
0day Rubbish Research Team is publicly disclosing 2 vulnerabilities in CIRCUTOR PowerStudio SCADA WAVE 24.11.6.0
(CIRCUTOR S.A.). The research is published and a proof-of-concept is available.
Vulnerability 1: Pre-authentication SYSTEM RCE (CVSS 9.8, pre-authentication)
The native engine PwrStudio.exe runs as the Windows service CircutorPowerStudioScadaServer under NT AUTHORITY\SYSTEM.
The shared fail-open JWT library (see companion advisory) accepts a forged alg=none JWT with role=Admin. Combined with
a path-traversal write of a malicious default.xeve events configuration (containing a shellExecute action) against
PSSWidgets (port 8105) and an HTTP engine restart against PSSAdministrator (port 8089), an unauthenticated attacker
forces the engine to reload the configuration and fire XCEventActionShellExecute::Execute, which reaches CreateProcessW
with attacker-controlled arguments as SYSTEM. Under a strict default deployment where 8089 is loopback-only with no
forwarding path, the chain does not close for a pure-remote unauthenticated attacker; once 8089 is reachable (reverse
proxy, rebind, same-host, or same segment), it is a full unauthenticated remote SYSTEM RCE.
Impact: Arbitrary command execution as NT AUTHORITY\SYSTEM on the SCADA host; the attacker controls the SCADA engine,
the event configuration, and the underlying Windows host.
Advisory: https://0day-rubbish.com/blog/circutor-powerstudio-unauth-shellExecute-rce
Vulnerability 2: JWT forgery / authentication bypass (CVSS 8.6, pre-authentication)
Every .NET Core microservice registers JWT Bearer authentication via a shared extension method configured fail-open: a
custom SignatureValidator that always returns a non-null token without validating the signature,
RequireSignedTokens=false, ValidateIssuerSigningKey=false, ValidateIssuer=false, ValidateAudience=false, and an
OnAuthenticationFailed handler that silently swallows exceptions. Any attacker-crafted alg=none JWT with any role claim
is accepted as a valid authenticated identity by every microservice's AdminSecure/UserSecure policy. No credentials, no
signing key, and no user account are required; only network reachability to the target microservice port. This is an
authentication-bypass/identity-forgery primitive that compromises the product's entire authentication trust root and is
the auth-bypass primitive that enables the companion shellExecute RCE chain.
Impact: Impersonate any Admin/User role and call any protected endpoint: stop/start the SCADA engine or microservices
(DoS), push configuration, upload/download/delete files, configure external communication, and manage licenses; no
credentials required.
Advisory: https://0day-rubbish.com/blog/circutor-powerstudio-jwt-alg-none-identity-forgery
PoC and full analysis: https://github.com/Exploit-Garbage/0day-Rubbish
--
0day Rubbish Research Team
https://0day-rubbish.com
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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