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Vulnerabilities

Vulnerability · CVE-2025-53782

Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

Published Oct 14, 2025 · catalog updated Oct 18, 2026 · exchange server subscription edition

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-53782. EPSS is 0.36%. Act only if a listed version of exchange server subscription edition is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.36%
Remediation
Version ranges on file
Affected products
cpe microsoft/exchange server · cpe microsoft/exchange server subscription edition · vendor Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 <15.02.1544.036

Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/exchange server2016
  • cpe microsoft/exchange server subscription edition< 15.02.2562.029
  • vendor Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 <15.02.1544.03615.02.0.0 <15.02.1544.036

How to fix CVE-2025-53782

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-53782. EPSS is 0.36%. Act only if a listed version of exchange server subscription edition is installed.

Which versions are affected?

Compare what you have installed with microsoft/exchange server 2016; microsoft/exchange server subscription edition < 15.02.2562.029; Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 <15.02.1544.036 15.02.0.0 <15.02.1544.036. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-303. EPSS 0.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft Exchange Server security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2025 · EUVD

    Detected

    Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

  2. Feb 22, 2026 · EUVD

    Updated

    Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

  3. Oct 18, 2026 · Monitored products — critical

    Updated

    Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

Sources

  • CVE.orgVulnerability recordCVE-2025-53782

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-53782

    30-day exploitation probability 0.36%

    first.org
  • EUVDVulnerability recordEUVD-2025-34428

    Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

    euvd.enisa.europa.eu
  • Monitored products — criticalVendor advisoryCVE-2025-53782

    Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — criticalNov 1, 2026
  • CVE.orgOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • EUVDOct 23, 2026