CVE-2026-62312
Authenticated Host-header bypass enables RCE in 9Router versions before 0.5.2.
Is CVE-2026-62312 being exploited?
Not confirmed. CVE-2026-62312 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 1.3% probability of exploitation in the next 30 days.
How severe is CVE-2026-62312?
CVE-2026-62312 is rated High. 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-2026-62312?
Yes. A fix has been recorded for CVE-2026-62312. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-62312 affect?
CVE-2026-62312 affects 9Router < 0.5.2, 9Router MCP plugin interface, Hosts running 9Router service. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-62312?
Upgrade to 0.5.2; restrict management API access and validate Host headers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated remote attacker can execute arbitrary OS commands via Host-header bypass and unvalidated MCP plugin args through /api/mcp//sse.
Patch when possible
- affected< 0.5.2
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.