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CVE-2026-69641· NVD / CVE Program· CNA microsoft

Microsoft Exchange Server Elevation of Privilege Vulnerability

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

CriticalCVSS 9.1 · v3.1—No exploit Fix available

Noroxi analysis

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Published
Sep 8, 2026
Updated
Sep 30, 2026
EPSS
0.9% · 57th percentile
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Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
9.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
microsoftexchange server
microsoftexchange server subscription edition

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft exchange server2016
  • microsoft exchange server2019
  • microsoft exchange server subscription editionbefore 15.02.2562.049

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 23

    • 15.01.0.0 and later · before 15.01.2507.073affected

  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 14

    • 15.02.0.0 and later · before 15.02.1544.046affected

  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 15

    • 15.02.0.0 and later · before 15.02.1748.051affected

  • Microsoft Microsoft Exchange Server Subscription Edition RTM

    • 15.02.0.0 and later · before 15.02.2562.049affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-34523Microsoft Exchange Server Elevation of Privilege VulnerabilityKEV
    96Now
  • CVE-2021-34473Microsoft Exchange Server Remote Code Execution VulnerabilityKEV
    96Now
  • CVE-2021-26855Microsoft Exchange Server Remote Code Execution VulnerabilityKEV
    96Now
  • CVE-2022-41040Microsoft Exchange Server Elevation of Privilege VulnerabilityKEV
    95Now
  • CVE-2020-0688A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, akKEV
    95Now
  • CVE-2021-42321Microsoft Exchange Server Remote Code Execution VulnerabilityKEV
    93Now

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Microsoft Exchange Server 2016 Cumulative Update 2315.01.2507.073 · KB5121611Microsoft (MSRC)
Microsoft Exchange Server 2019 Cumulative Update 1415.02.1544.046 · KB5121610Microsoft (MSRC)
Microsoft Exchange Server 2019 Cumulative Update 1515.02.1748.051 · KB5121609Microsoft (MSRC)
Microsoft Exchange Server Subscription Edition RTM15.02.2562.049 · KB5121608Microsoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-693800 days apartMicrosoft Exchange Server Elevation of Privilege Vulnerability
    32Monitor
  • CVE-2026-6291528 days apartMicrosoft Exchange Server Security Feature Bypass Vulnerability
    26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-862 · Missing Authorization

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records