# CVE-2026-58617: M365 Copilot for iOS Elevation of Privilege Vulnerability

Status: published. Published: 2026-07-14. Updated: 2026-11-10.

Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: microsoft) — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58617

## Affected products and versions

- Microsoft / Microsoft 365 Copilot for iOS: ≥ 1.0; < 2.111.4 (affected, custom). Source: CNA: microsoft

## Severity and prioritization

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C; source: CNA: microsoft

- CISA KEV: No listing in collected sources

- EPSS: 0.79% as of 2026-11-10; percentile 56.48%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-284

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58617 (CNA: microsoft; vendor-advisory, patch)

## Provenance

- CNA: microsoft: https://www.cve.org/CVERecord?id=CVE-2026-58617; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-58617; retrieved 2026-11-10; source updated Not reported

Revision: fc044a9a16a4ba5826d75a6ca9e019f0ec31caffd4cef152d327dcf018bddc03

Canonical: https://y2.dev/cve/CVE-2026-58617

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.