CVE-2026-60009
Unauthenticated arbitrary file write in Eclipse Theia (<=1.73.1) via POST /file-upload.
Is CVE-2026-60009 being exploited?
Not confirmed. CVE-2026-60009 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-60009?
CVE-2026-60009 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-2026-60009?
Yes. A fix has been recorded for CVE-2026-60009. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-60009 affect?
CVE-2026-60009 affects Eclipse Theia <= 1.73.1 (browser deployments), @theia/filesystem backend, Web deployments with filesystem enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-60009?
Immediately restrict/disable /file-upload, enforce auth, block cross-origin requests, and upgrade when vendor patch is released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated HTTP multipart write of attacker-specified absolute paths outside workspace, enabling remote code execution (e.g., overwrite ~/.bashrc).
Immediate action required
- affected< 1.74.0
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.