EUVD-2026-43095
GHSA-88vc-rc72-29f3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote, unauthenticated, low-complexity abuse of an unthrottled auth endpoint whose stated impact is denial-of-service, so A:H with C:N/I:N; the official vector's VI:H conflicts with the DoS description.
Primary rating from Vendor (icscert).
CVSS VectorVendor: icscert
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
Previously, there was no throttling on repeated authentication attempts to the charging station backend, which could allow an attacker to execute a denial-of-service attack.
AnalysisAI
Denial-of-service exposure in the Hydro-Québec Le Circuit Électrique EV charging-station backend allows remote, unauthenticated attackers to hammer the authentication endpoint without rate limiting, degrading or exhausting the service that charging stations rely on. The flaw (CWE-307, missing throttling of repeated auth attempts) affects all backend versions prior to the June 2026 fix and carries a CVSS 4.0 base score of 8.7. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against the authentication endpoint of the Le Circuit Électrique charging-station backend, per CVSS AV:N/AC:L/AT:N/PR:N/UI:N. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are moderately strong but internally inconsistent, and this should be flagged. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker with no credentials scripts a high rate of authentication requests against the charging-station backend's login endpoint; because no throttling exists, the requests are accepted indefinitely, exhausting authentication resources and preventing legitimate stations from authorizing charging sessions. The same lack of throttling would also permit unlimited automated credential guessing. … |
| Remediation | Because this is a vendor-hosted backend, the fix is applied server-side by Hydro-Québec: per the EUVD record the issue is resolved as of the June 2026 backend version, so operators should confirm their environment is on the June 2026 or later backend and require no client-side patching of field stations. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Implement rate limiting on the authentication endpoint and enable DDoS mitigation controls; monitor authentication traffic for anomalous patterns. …
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Authentication bypass in the Hydro-Québec Le Circuit Électrique EV charging station backend lets remote unauthenticated
Backend resource exhaustion in Hydro-Québec's Le Circuit Electrique EV charging station backend (all versions prior to t
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External POC / Exploit Code
Leaving vuln.today