CVE-2026-71262
Unauthenticated path traversal in IoTSharp BlobStorage enables arbitrary file R/W and RCE
Is CVE-2026-71262 being exploited?
Not confirmed. CVE-2026-71262 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-71262?
CVE-2026-71262 is rated Critical with a CVSS score of 9.8. 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-2026-71262?
Not known from our data. No patch reference has been recorded for CVE-2026-71262, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-71262 affect?
CVE-2026-71262 affects IoTSharp BlobStorageController endpoints (Upload/Download/List/Modify/Delete), ASP.NET Core deployments using IoTSharp, Web-accessible blob storage directories used by IoTSharp. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71262?
Patch or block access; enforce global [Authorize], sanitize path inputs, and restrict web-write directories.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can traverse paths to read/write/modify/delete files and upload webshells, enabling remote code execution on affected servers.
Immediate action required
- affected<= *
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.