GHSA-3c39-338m-m4vp · 深刻度： high — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft...
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.
総合評価: CVE-2026-42897 は在野悪用が確認された重大脅威（92.7/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 5.64%、92 パーセンタイル） 根拠: CISA KEV に登録（追加日 2026-05-15）。Microsoft / Microsoft が対象で、弱点分類 CWE-79の悪用が確認されています。未認証でリモート管理権限を奪取されるリスクが極めて高い。 直近 1 日で EPSS が +3.13% 上昇。悪用への関心が高まっている可能性があります。 推奨対応: CISA の対応期限を過ぎています。緊急のパッチ適用を最優先に検討してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
: Microsoft Exchange Server Cross-Site Scripting Vulnerability · CISA KEV の詳細
: 2026-05-15
: 2026-05-29
: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-23 | 2.51% | 5.64% | +3.13% |
| 2 | 2026-06-15 | 7.86% | 2.51% | -5.35% |
| 3 | 2026-06-05 | — | 7.86% | — |
EPSS の全履歴 （全 13 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 8.1 | 3.1 | HIGH |
|
2.8 | 5.2 | [email protected] |
| 6.1 | 3.1 | MEDIUM |
|
2.8 | 2.7 | [email protected] |
GHSA-3c39-338m-m4vp · 深刻度： high — Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft...
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_3:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_4:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_6:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_7:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:* |
| microsoft | exchange_server | 2016 | cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_12:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* |
| microsoft | exchange_server | 2019 | cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:* |
| microsoft | exchange_server_subscription_edition | < 15.02.2562.043 | cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897 | Mitigation Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897 | US Government Resource |