Security readout for executives and security teams
Plain-English summary
Microsoft 365 Copilot contains an open-redirect flaw that could let an unauthenticated remote attacker abuse a user’s interaction to gain elevated privileges. Successful exploitation could seriously affect confidentiality and integrity, but the supplied evidence does not identify affected versions or document real-world exploitation.
Executive priority
Treat as an urgent validation and remediation item because the reported impact is critical and may compromise sensitive data or actions. Prioritize Copilot-enabled environments, while recognizing that active exploitation is not established by the supplied evidence.
Technical view
CVE-2026-33102 is classified as CWE-601. Its CVSS 3.1 vector indicates network access, low complexity, no prior privileges, required user interaction, changed scope, and high confidentiality and integrity impact. Availability impact is not identified. The source bundle provides no technical attack-chain details.
Likely exposure
Organizations using Microsoft 365 Copilot should consider themselves potentially exposed until Microsoft’s advisory confirms applicability and remediation status. The supplied sources list no affected versions, deployment conditions, tenant configurations, or reliable exposure indicators.
Exploitation context
The CVSS vector indicates a remote, unauthenticated attacker still requires user interaction. The CVE is not listed as CISA KEV in the supplied bundle, and no cited source establishes active exploitation or public exploit availability.
Researcher notes
Important details remain unavailable in the bundle: affected versions, vulnerable request flows, privilege boundary crossed, indicators of compromise, and exact remediation mechanics. Researchers should use Microsoft’s advisory as the authoritative source and avoid treating the CVSS vector alone as proof of exploitability in every tenant.
Mitigation direction
- Review Microsoft’s CVE advisory for current remediation and affected-service guidance.
- Confirm whether Microsoft 365 Copilot is enabled or available within the organization.
- Apply or verify Microsoft-directed remediation promptly; the supplied bundle does not describe it.
- Warn users to treat unexpected Copilot-linked redirects and authentication prompts cautiously.
Validation and detection
- Inventory tenants and users with access to Microsoft 365 Copilot.
- Compare tenant applicability and remediation status against Microsoft’s current advisory.
- Verify that Microsoft-directed updates or service-side protections are active.
- Review relevant security records for suspicious Copilot-linked redirects or privilege changes.
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-2026-33102 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.