CVE-2026-59864
Kiota plugin generator path traversal allows file inclusion in Teams/Copilot plugin manifests
Is CVE-2026-59864 being exploited?
Not confirmed. CVE-2026-59864 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-2026-59864?
CVE-2026-59864 is rated Critical with a CVSS score of 9.3. 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-2026-59864?
Yes. A fix has been recorded for CVE-2026-59864. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-59864 affect?
CVE-2026-59864 affects Kiota < 1.32.5, kiota plugin add, kiota plugin generate -t APIPlugin, Generated Microsoft 365 Copilot plugins, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-59864?
Upgrade Kiota to >=1.32.5 and sanitize/validate template file paths in build pipelines.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Path traversal in template.file permits inclusion of arbitrary/out-of-package files in generated Teams/Copilot plugins, enabling data disclosure or malicious code when deployed.
Patch when possible
- affected>= 1.30.0 and < 1.31.1
- affected< 1.29.1
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.