CVE-2026-21527
Microsoft Exchange Server Spoofing Vulnerability
MEDIUM 6.5
At a glance
- Source
- NVD
- EPSS
- EPSS 8.26 % · percentile 95 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Weaknesses (CWE)
- CWE-451 — User Interface (UI) Misrepresentation of Critical Information
- CWE-345 — Insufficient Verification of Data Authenticity
- CWE-1286 — Improper Validation of Syntactic Correctness of Input
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | NVD · secure@microsoft.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-7340
- GCVE · GCVE-0-2026-21527
CERT-FR advisories
- CERTFR-2026-AVI-0153 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*< 15.02.2562.037
Affected products
| Product | Versions |
|---|---|
| Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23 | affected 15.01.0.0 < 15.01.2507.066 |
| Microsoft · Microsoft Exchange Server 2019 Cumulative Update 14 | affected 15.02.0.0 < 15.02.1544.039 |
| Microsoft · Microsoft Exchange Server 2019 Cumulative Update 15 | affected 15.02.0.0 < 15.02.1748.043 |
| Microsoft · Microsoft Exchange Server Subscription Edition RTM | affected 15.02.0.0 < 15.02.2562.037 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |