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CVE-2026-42897

Improper neutralization of input during web page generation ('cross-site scripting') 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:a9b3ba291e086c5e6800e90bfec961c306e126fa9c115695f0ae2119f440aa4b
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","versions":[{"lessThan":"15.01.2507.069","status":"affected","version":"15.01.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/0

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 15","vendor":"Microsoft","versions":[{"lessThan":"15.02.1748.046","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/2

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server Subscription Edition RTM","vendor":"Microsoft","versions":[{"lessThan":"15.02.2562.043","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/3

{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 14","vendor":"Microsoft","versions":[{"lessThan":"15.02.1544.041","status":"affected","version":"15.02.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/1

Affected products and versions

4 source assertions
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","versions":[{"lessThan":"15.01.2507.069","status":"affected","version":"15.01.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/0
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 15","vendor":"Microsoft","versions":[{"lessThan":"15.02.1748.046","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/2
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server Subscription Edition RTM","vendor":"Microsoft","versions":[{"lessThan":"15.02.2562.043","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/3
{"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 14","vendor":"Microsoft","versions":[{"lessThan":"15.02.1544.041","status":"affected","version":"15.02.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"cwes":["CWE-79"],"dateAdded":"2026-05-15","dueDate":"2026-05-29","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897 ; https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-emergency-mitigation-service ; https://nvd.nist.gov/vuln/detail/CVE-2026-42897","product":"Microsoft","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shor…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:cb3970fe8f0a761ab651ccff60fe34812698a94ec43d189397e361fd2edb0988 · sha256:16acee8334e59e44… · /vulnerabilities/65
    Open source location →
{"cwes":["CWE-79"],"dateAdded":"2026-05-15","dueDate":"2026-05-29","knownRansomwareCampaignUse":"Unknown","notes":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897 ; https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-emergency-mitigation-service ; https://nvd.nist.gov/vuln/detail/CVE-2026-42897","product":"Microsoft","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shor…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:9d5e82027373b051fc5dc1b4f97434ce4adafdb6b69af0ae9526b419ee02fc90 · sha256:635dff916c4092c0… · /vulnerabilities/68
    Open source location →

Source references

2 source assertions
{"name":"Microsoft Exchange Server Spoofing Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f3fafd2aa7a0dda052979d4f322c4a44385b798c4d74a4b951555c3158b6af2 · sha256:1846df5afc9f044c… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • 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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