Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Evidence dossier
CVE-2026-42897
Microsoft Exchange Server Spoofing Vulnerability
60.0–80.0Priority evidence range
gen-56ccdaf9Normalized restatement
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.
- State
- PUBLISHED
- Published
- May 14, 2026
- Updated
- Jun 19, 2026
- Evidence coverage
- 72%
2026-07-18 · v2026.06.15 · percentile 92.1%
Distinct CVSS assessments remain side by side; none are averaged.
Source comparison
Who said what
microsoftoriginal assertion
container
Microsoft Exchange Server Spoofing Vulnerability
Jul 19, 2026Original evidence ↗
CISA KEVoriginal assertion
observed_exploitation
Microsoft Exchange Server Cross-Site Scripting Vulnerability
Jul 19, 2026Original evidence ↗
FIRST EPSSoriginal assertion
model_probability
Probability 0.056400000000; percentile 0.920760000000
Jul 19, 2026Original evidence ↗
Applicability
Cited product scope
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 23
[{"status": "affected", "version": "15.01.0.0", "lessThan": "15.01.2507.069", "versionType": "custom"}]unknownMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 14
[{"status": "affected", "version": "15.02.0.0", "lessThan": "15.02.1544.041", "versionType": "custom"}]unknownMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 15
[{"status": "affected", "version": "15.02.0.0", "lessThan": "15.02.1748.046", "versionType": "custom"}]unknownMicrosoftMicrosoft Exchange Server Subscription Edition RTM
[{"status": "affected", "version": "15.02.0.0", "lessThan": "15.02.2562.043", "versionType": "custom"}]unknownUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_3:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_4:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_6:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_7:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_12:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*supportedUnknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*; end excluding 15.02.2562.043supportedAssessments
CVSS by origin
nvd@nist.govCVSS 3.1 · role Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecure@microsoft.comCVSS 3.1 · role Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NmicrosoftCVSS 3.1 · role unknown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:CLimitations and unknowns
- KEV membership is authoritative for the catalog, not proof of exposure in any environment.
- EPSS is a dated model probability and not an individual-environment prediction.
- Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
- NVD-carried upstream facts remain derivative and are not independent corroboration.
- Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
- NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
- Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
- Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.