Security readout for executives and security teams
Plain-English summary
Microsoft reports a critical Microsoft 365 Copilot issue where an open redirect can let an unauthenticated network attacker elevate privileges if a user interacts. The source data does not show known active exploitation. Because Copilot may access sensitive business data, organizations using it should treat this as urgent and follow Microsoft’s advisory.
Executive priority
High priority for organizations using Microsoft 365 Copilot, especially where Copilot can access sensitive documents, mail, or business workflows. Prioritize confirmation of Microsoft remediation and tenant exposure.
Technical view
CVE-2026-41106 is a CWE-601 open redirect in Microsoft 365 Copilot. CVSS 3.1 is 9.3: network exploitable, low complexity, no privileges required, user interaction required, scope changed, high confidentiality and integrity impact, no availability impact. Microsoft lists an official fix, but public details are limited.
Likely exposure
Exposure is likely limited to organizations using Microsoft 365 Copilot. The provided data does not identify specific versions, tenant configurations, or prerequisites beyond user interaction and network reachability.
Exploitation context
The CVSS vector indicates exploitation requires user interaction but no attacker privileges. The CVE is not listed as KEV in the provided bundle, and the exploit maturity is marked unproven.
Researcher notes
Public information is sparse. The core weakness is open redirect leading to elevation of privilege, with user interaction required. Avoid assuming exploitability details beyond the CVSS vector and Microsoft advisory.
Mitigation direction
- Review Microsoft’s CVE-2026-41106 advisory for tenant-specific guidance.
- Apply Microsoft’s listed update or remediation when available for your environment.
- Warn users about unexpected Copilot or Microsoft 365 links until remediation is confirmed.
- Monitor Microsoft 365 audit logs for unusual Copilot-related access patterns.
Validation and detection
- Confirm whether Microsoft 365 Copilot is enabled in the tenant.
- Check Microsoft’s advisory for affected service status or required customer action.
- Verify remediation status through Microsoft 365 admin center or MSRC guidance.
- Review security logs for suspicious privilege changes or anomalous data access.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-601: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-41106 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C2.85.8microsoftVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft 365 Copilot Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.