CVE-2026-48561 — Microsoft Edge Copilot Remote Code Execution Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Microsoft 365 Copilot, Microsoft Microsoft Edge Copilot for Android, Microsoft Microsoft Edge Copilot for IOS).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
5. Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-77 · Command Injection

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Look for parameters with command/query metacharacters and unexpected child processes of the service.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · microsoft/microsoft edge copilot for android, microsoft/microsoft edge copilot for ios
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 15, 2026
• CVSS changed · 9.6
  Oct 15, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 15, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 15, 2026 · NIST National Vulnerability Database
• CVE published
  Jul 14, 2026 · microsoft

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48561
  Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-85887 M365 Copilot Information Disclosure Vulnerability 27d
• Critical CVE-2026-85885 Microsoft 365 Copilot Elevation of Privilege Vulnerability 27d
• Critical CVE-2026-50517 Deserialization of Untrusted Data in Microsoft 365 Copilot Jul 23, 2026
• Critical CVE-2026-58617 M365 Copilot for iOS Elevation of Privilege Vulnerability Jul 14, 2026
• High CVE-2026-50387 Windows GDI Elevation of Privilege Vulnerability Jul 14, 2026
• Critical CVE-2026-41106 Microsoft 365 Copilot Elevation of Privilege Vulnerability Jul 2, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No FIRST EPSS score.
• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-48561 is "Microsoft Edge Copilot Remote Code Execution Vulnerability", rated Critical. It affects 365 Copilot (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.6 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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