Security readout for executives and security teams
Plain-English summary
CVE-2026-49159 is a Microsoft Graph information disclosure issue. An attacker who is already authorized could disclose sensitive information over the network without user interaction. Microsoft rates it medium severity with high confidentiality impact. No source provided indicates active exploitation.
Executive priority
Treat as a near-term confidentiality risk, not an emergency based on current evidence. Prioritize confirmation of Microsoft guidance and reduction of unnecessary Graph access because the issue can expose sensitive information to an authorized actor.
Technical view
The CVE describes CWE-200 exposure of sensitive information in Microsoft Graph. CVSS 3.1 is 6.5: network attack vector, low complexity, low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity or availability impact. Microsoft’s advisory is the primary remediation source.
Likely exposure
Organizations using Microsoft Graph should review exposure. The source bundle does not identify specific affected versions, tenant configurations, APIs, or permission scopes, so exact exposure requires Microsoft guidance and environment review.
Exploitation context
The attacker must be authorized and able to access the target over a network. The provided data shows exploit maturity as unproven and KEV is false. There is no cited evidence of active exploitation.
Researcher notes
Public details are limited. Do not assume affected endpoints, permissions, or exploitability beyond the CVE text and CVSS vector. Key unknowns include exact data exposed, affected configurations, and whether remediation is service-side or customer-actionable.
Mitigation direction
- Review the Microsoft MSRC advisory for CVE-2026-49159.
- Apply Microsoft’s provided update or remediation guidance where applicable.
- Review Microsoft Graph app permissions and remove unnecessary access.
- Monitor Microsoft advisory updates for affected-scope clarification.
Validation and detection
- Confirm whether your organization uses Microsoft Graph-dependent applications or integrations.
- Check Microsoft’s advisory for deployment status and required remediation.
- Review logs for unusual authorized Graph access patterns.
- Document affected tenants, apps, permissions, and remediation decisions.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCVE-2026-49159 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C2.83.6microsoftVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
- Microsoft Graph 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.