CVE-2026-49357
Unauthenticated HTTP endpoint exposes MCP actions, bypasses auth on LINE Desktop.
Is CVE-2026-49357 being exploited?
Not confirmed. CVE-2026-49357 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 0.56% probability of exploitation in the next 30 days.
How severe is CVE-2026-49357?
CVE-2026-49357 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-2026-49357?
Yes. A fix has been recorded for CVE-2026-49357. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49357 affect?
CVE-2026-49357 affects Line Desktop MCP (line-desktop-mcp), LINE Desktop app (Windows/macOS). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49357?
Update to v1.1.2+; restrict exposure (0.0.0.0).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network attacker can reach /mcp to read chat history and send messages via the desktop app.
Patch when possible
- affected< 1.1.2
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.