GHSA-m2qf-hxjv-5gpq · 深刻度： high · エコシステム： pip — Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches `Set-Cookie` headers, it may send one client's `session` cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met. 1. The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies. 2. The application sets `session.permanent = True` 3. The application does not access or modify the session at any point during a request. 4. `SESSION_REFRESH_EACH_REQUEST` enabled (the default). 5. The application does not set a `Cache-Control` header to indicate that a page is private or should not be cached. This happens because vulnerable versions of Flask only set the `Vary: Cookie` header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.
総合評価: CVE-2023-30861 は中リスク（54/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 1.25%、65 パーセンタイル） 根拠: 直近 1 日で EPSS が +1.06% 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: 影響資産を整理し、修補計画に組み込んでください。
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。
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 | 2026-06-15 | 0.18% | 1.25% | +1.06% |
| 2 | 2025-11-21 | 0.92% | 0.18% | -0.73% |
| 3 | 2025-11-18 | — | 0.92% | — |
EPSS の全履歴 （全 18 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-m2qf-hxjv-5gpq · 深刻度： high · エコシステム： pip — Flask vulnerable to possible disclosure of permanent session cookie due to missing Vary: Cookie header
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2023-30861 not yet assigned priority: Debian including 1 source packages (flask), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2023-30861 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2023-30861 |
suse
|
high | CVE-2023-30861 severity important: SUSE including 20 source package names (1.10.1.16.4.5.420:python3-Flask-1.0.2-150100.6.3.1, 3.8.0.1.0.4.5.49:python3-Flask-1.0.2-150100.6.3.1, …), 57 product×package rows across 43 product lines (Container ses/7.1/cephcsi/cephcsi, Container ses/7.1/rook/ceph, … (43 product lines)): Fixed 53, Known Not Affected 4. | https://www.suse.com/security/cve/CVE-2023-30861/ |
ubuntu
|
medium | CVE-2023-30861 medium priority: Ubuntu including 1 source packages (flask), 8 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): released 4, not-affected 2, ignored 1, needs-triage 1. | https://ubuntu.com/security/CVE-2023-30861 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| palletsprojects | flask | < 2.2.5 | cpe:2.3:a:palletsprojects:flask:*:*:*:*:*:*:*:* |
| palletsprojects | flask | >= 2.3.0, < 2.3.2 | cpe:2.3:a:palletsprojects:flask:*:*:*:*:*:*:*:* |