CVE-2026-0300（paloaltonetworks pan-os）の深刻度・悪用状況・対象バージョン
9.8 緊急（CVSS 3.x） 悪用確認済み（CISA KEV） EPSS 取得中…
概要
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
実際の攻撃で悪用されています。 CISA KEV への追加日: 2026-05-06。対象製品を使っている場合は最優先で対策してください。
CISA の要求対応: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
CISA の要求対応: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| paloaltonetworks | pan-os | 10.2.0 |
| paloaltonetworks | pan-os | 10.2.1 |
| paloaltonetworks | pan-os | 10.2.2 |
| paloaltonetworks | pan-os | 10.2.3 |
| paloaltonetworks | pan-os | 10.2.4 |
| paloaltonetworks | pan-os | 10.2.5 |
| paloaltonetworks | pan-os | 10.2.6 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
| paloaltonetworks | pan-os | 10.2.7 |
基本情報
- 公開日
- 2026-05-06
- 最終更新
- 2026-10-26
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-787
- CVSS 4.0
- 9.3（CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:M/U:Red）
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2026-0300 を検索 できます。
参考情報
- https://security.paloaltonetworks.com/CVE-2026-0300 MitigationVendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-967325.html Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300 US Government Resource
- NVD: CVE-2026-0300
- CVE.org: CVE-2026-0300
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。