CVE-2026-55637
DNS rebinding lets web pages control GenieACS via unauthenticated MCP listener.
Is CVE-2026-55637 being exploited?
Not confirmed. CVE-2026-55637 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.21% probability of exploitation in the next 30 days.
How severe is CVE-2026-55637?
CVE-2026-55637 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55637?
Yes. A fix has been recorded for CVE-2026-55637. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55637 affect?
CVE-2026-55637 affects genieacs-mcp <0.3.2, GenieACS NBI, CPE devices managed by GenieACS, Default MCP listener 127.0.0.1:8080. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55637?
Upgrade to genieacs-mcp 0.3.2, set MCP_AUTH_TOKEN, restrict MCP_LISTEN_ADDR, validate Host/Origin
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
DNS rebinding to unauthenticated MCP HTTP listener allows remote attackers to invoke GenieACS NBI: reboot devices, push firmware, change TR-069 params, provision or run tasks.
Immediate action required
- affected< 0.3.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.