Security readout for executives and security teams
Plain-English summary
CVE-2026-24299 is a Microsoft 365 Copilot information disclosure issue. A remote unauthenticated attacker could cause sensitive information exposure if user interaction occurs. The CVSS score is medium, but confidentiality impact is high, so organizations using Copilot should treat it as a targeted data-exposure risk.
Executive priority
Prioritize remediation for Copilot-enabled environments handling sensitive data. This is not a known exploited critical issue from the supplied evidence, but it can affect confidentiality and should be closed through Microsoft guidance.
Technical view
The CVE describes command injection from improper neutralization of command special elements in Microsoft 365 Copilot. The vector is AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N, meaning remote, high-complexity exploitation requiring user interaction, with confidentiality impact only. Microsoft lists remediation availability through its advisory.
Likely exposure
Exposure is limited to organizations using Microsoft 365 Copilot. The source bundle does not identify specific versions, tenant configurations, or affected deployment conditions beyond the Microsoft 365 Copilot product entry.
Exploitation context
The CVE is not listed as KEV in the bundle, and the CVSS exploit maturity is unproven. The available evidence supports potential remote information disclosure, not confirmed active exploitation.
Researcher notes
Key unknowns remain: affected versions are not specified, exploitation details are not public in the bundle, and no independent exploit confirmation is cited. Treat validation as exposure and remediation confirmation rather than exploit reproduction.
Mitigation direction
- Review the Microsoft MSRC advisory for official remediation guidance.
- Apply any Microsoft-listed update or service remediation for CVE-2026-24299.
- Confirm Microsoft 365 Copilot deployments are covered by current vendor guidance.
- Restrict Copilot access to users with business need until remediation is confirmed.
- Review sensitive data permissions available to Copilot-connected users.
Validation and detection
- Confirm whether Microsoft 365 Copilot is enabled in the environment.
- Track CVE-2026-24299 remediation status in vulnerability management records.
- Compare tenant or product status against the MSRC advisory.
- Review Copilot access and audit logs for unusual information access.
- Validate least-privilege permissions for data reachable through Copilot.
Public sources used
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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-24299 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C1.63.6microsoftVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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
- M365 Copilot Information Disclosure 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.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.