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CVE-2026-21527

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cc9cd833bbcc17432a280545c1991e874eb16d902a01672da3409f7bba3df206
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 15","vendor":"Microsoft","versions":[{"lessThan":"15.02.1748.043","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/2

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server Subscription Edition RTM","vendor":"Microsoft","versions":[{"lessThan":"15.02.2562.037","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/3

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","versions":[{"lessThan":"15.01.2507.066","status":"affected","version":"15.01.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/0

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 14","vendor":"Microsoft","versions":[{"lessThan":"15.02.1544.039","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/1
cwe · 3 assertions

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en-US","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/1

{"cweId":"CWE-1286","description":"CWE-1286: Improper Validation of Syntactic Correctness of Input","lang":"en-US","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/2

{"cweId":"CWE-451","description":"CWE-451: User Interface (UI) Misrepresentation of Critical Information","lang":"en-US","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

4 source assertions
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 15","vendor":"Microsoft","versions":[{"lessThan":"15.02.1748.043","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/2
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server Subscription Edition RTM","vendor":"Microsoft","versions":[{"lessThan":"15.02.2562.037","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/3
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","versions":[{"lessThan":"15.01.2507.066","status":"affected","version":"15.01.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/0
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 14","vendor":"Microsoft","versions":[{"lessThan":"15.02.1544.039","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":6.5,"baseSeverity":"MEDIUM","vectorString":"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","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/1
{"cweId":"CWE-1286","description":"CWE-1286: Improper Validation of Syntactic Correctness of Input","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/2
{"cweId":"CWE-451","description":"CWE-451: User Interface (UI) Misrepresentation of Critical Information","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"Microsoft Exchange Server Spoofing Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1956d875b6fa85fddcccddf75eee8611ac8fc3f939e74605e4e191eeef9fbd4e · sha256:50c9cafb3527af4d… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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