CVE-2026-20792 Unknown Vendor CVE debrief

Who should care

Security, operations, and incident response teams responsible for Chargemap/chargemap.com deployments, especially anyone monitoring WebSocket authentication, charger telemetry availability, or access-control abuse.

Technical summary

The advisory describes a network-reachable WebSocket authentication weakness: there are no limits on authentication request volume. CISA states this may enable denial-of-service by suppressing or misrouting charger telemetry, and may also support brute-force attempts to gain unauthorized access. The provided CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, which aligns with the availability impact emphasized in the source.

Defensive priority

High

Recommended defensive actions

• Add server-side rate limiting and progressive backoff to WebSocket authentication endpoints.
• Implement alerting for repeated authentication failures, credential-spraying patterns, and unusual WebSocket session churn.
• Restrict exposure of the WebSocket service to the smallest necessary network scope and apply edge controls where available.
• Review telemetry handling so missed, delayed, or misrouted charger data is detected and reconciled quickly.
• Verify whether Chargemap has issued a fix or operational guidance; the advisory says CISA did not receive a coordination response from the vendor.
• Use the CISA advisory and official CVE/NVD records to track any later updates or status changes.

Evidence notes

Primary evidence comes from the CISA CSAF advisory ICSA-26-057-05 (published 2026-02-26), which names the product as “Chargemap chargemap.com vers:all/*” and states that the WebSocket API lacks restrictions on authentication requests. The advisory explicitly cites denial-of-service, telemetry suppression/misrouting, and brute-force access as possible outcomes. The remediation section says Chargemap did not respond to CISA’s coordination request. The advisory also includes an SSVCv2 notation dated 2026-02-25T07:00:00.000000Z.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.