CVE-2026-0300

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2026-0300

Confirmed

Yes

2026-05-06 00:00 UTC

Timestamps

2026-05-06

2026-05-06

Scope

KEV entry: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability | Affected: Palo Alto Networks / PAN-OS | Description: Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. | Required action: 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. | Due date: 2026-05-09 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

References
  • {'id': 'CVE-2026-0300', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-0300'}

0cc7a63e-d4b1-4e12-a527-005dc935b802

405284c2-e461-4670-8979-7fd2c9755a60

2026-05-06 19:00 UTC

2026-05-06 19:00 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-787"
  ],
  "date_added": "2026-05-06",
  "due_date": "2026-05-09",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "PAN-OS",
  "vendorProject": "Palo Alto Networks",
  "vulnerabilityName": "Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability"
}
 -
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