CVE-2026-0300 (GCVE-0-2026-0300)
Vulnerability from cvelistv5
Published
2026-05-06 18:57
Modified
2026-06-09 09:02
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-787 - Out-of-bounds Write
Summary
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.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
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Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Palo Alto Networks | Cloud NGFW |
Patch: All |
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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog
Date added: 2026-05-06
Due date: 2026-05-09
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. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
Used in ransomware: Unknown
Notes: https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
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"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"exploitMaturity": "ATTACKED",
"privilegesRequired": "NONE",
"providerUrgency": "RED",
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"providerMetadata": {
"dateUpdated": "2026-05-06T22:09:48.796Z",
"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"shortName": "palo_alto"
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"url": "https://security.paloaltonetworks.com/CVE-2026-0300"
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"value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\u003cbr\u003e\u003cbr\u003eWe strongly recommend that you secure access to your User-ID\u2122 Authentication Portal following the instructions in the workarounds section below."
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"source": {
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"value": "Updated with Threat Prevention ID and clarified the Required Configuration section."
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{
"lang": "en",
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"title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID\u2122 Authentication Portal",
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],
"value": "Customers can mitigate the risk of this issue by taking either of the following actions:\n\n * Restrict User-ID\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users\u0027 browsers ingress. Refer to Step 6 of the following Live Community article (https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286) and Knowledgebase article (https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC) for steps to restrict access.\n \n * Disable User-ID\u2122 Authentication Portal if not required.\n \n\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support."
}
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"PAN-OS 11.1.4-h1",
"PAN-OS 11.1.4",
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"PAN-OS 11.1.3-h12",
"PAN-OS 11.1.3-h11",
"PAN-OS 11.1.3-h10",
"PAN-OS 11.1.3-h9",
"PAN-OS 11.1.3-h8",
"PAN-OS 11.1.3-h7",
"PAN-OS 11.1.3-h6",
"PAN-OS 11.1.3-h5",
"PAN-OS 11.1.3-h4",
"PAN-OS 11.1.3-h3",
"PAN-OS 11.1.3-h2",
"PAN-OS 11.1.3-h1",
"PAN-OS 11.1.3",
"PAN-OS 11.1.2-h18",
"PAN-OS 11.1.2-h17",
"PAN-OS 11.1.2-h16",
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"PAN-OS 11.1.2-h14",
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"PAN-OS 11.1.2-h12",
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"PAN-OS 11.1.2-h9",
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"PAN-OS 11.1.2-h5",
"PAN-OS 11.1.2-h4",
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"PAN-OS 11.1.2-h2",
"PAN-OS 11.1.2-h1",
"PAN-OS 11.1.2",
"PAN-OS 11.1.1-h2",
"PAN-OS 11.1.1-h1",
"PAN-OS 11.1.1",
"PAN-OS 11.1.0-h4",
"PAN-OS 11.1.0-h3",
"PAN-OS 11.1.0-h2",
"PAN-OS 11.1.0-h1",
"PAN-OS 11.1.0",
"PAN-OS 10.2.18-h1",
"PAN-OS 10.2.18",
"PAN-OS 10.2.17",
"PAN-OS 10.2.16-h6",
"PAN-OS 10.2.16-h4",
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"PAN-OS 10.2.16",
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"PAN-OS 10.2.14-h1",
"PAN-OS 10.2.14",
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"PAN-OS 10.2.13-h4",
"PAN-OS 10.2.13-h3",
"PAN-OS 10.2.13-h2",
"PAN-OS 10.2.13-h1",
"PAN-OS 10.2.13",
"PAN-OS 10.2.12-h6",
"PAN-OS 10.2.12-h5",
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"PAN-OS 10.2.12-h2",
"PAN-OS 10.2.12-h1",
"PAN-OS 10.2.12",
"PAN-OS 10.2.11-h13",
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"PAN-OS 10.2.11-h9",
"PAN-OS 10.2.11-h8",
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"PAN-OS 10.2.11-h4",
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"PAN-OS 10.2.11",
"PAN-OS 10.2.10-h31",
"PAN-OS 10.2.10-h30",
"PAN-OS 10.2.10-h27",
"PAN-OS 10.2.10-h26",
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"PAN-OS 10.2.10-h21",
"PAN-OS 10.2.10-h18",
"PAN-OS 10.2.10-h17",
"PAN-OS 10.2.10-h14",
"PAN-OS 10.2.10-h13",
"PAN-OS 10.2.10-h12",
"PAN-OS 10.2.10-h11",
"PAN-OS 10.2.10-h10",
"PAN-OS 10.2.10-h9",
"PAN-OS 10.2.10-h8",
"PAN-OS 10.2.10-h7",
"PAN-OS 10.2.10-h6",
"PAN-OS 10.2.10-h5",
"PAN-OS 10.2.10-h4",
"PAN-OS 10.2.10-h3",
"PAN-OS 10.2.10-h2",
"PAN-OS 10.2.10-h1",
"PAN-OS 10.2.10",
"PAN-OS 10.2.9-h21",
"PAN-OS 10.2.9-h20",
"PAN-OS 10.2.9-h19",
"PAN-OS 10.2.9-h18",
"PAN-OS 10.2.9-h17",
"PAN-OS 10.2.9-h16",
"PAN-OS 10.2.9-h15",
"PAN-OS 10.2.9-h14",
"PAN-OS 10.2.9-h13",
"PAN-OS 10.2.9-h12",
"PAN-OS 10.2.9-h11",
"PAN-OS 10.2.9-h10",
"PAN-OS 10.2.9-h9",
"PAN-OS 10.2.9-h8",
"PAN-OS 10.2.9-h7",
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"PAN-OS 10.2.9-h5",
"PAN-OS 10.2.9-h4",
"PAN-OS 10.2.9-h3",
"PAN-OS 10.2.9-h2",
"PAN-OS 10.2.9-h1",
"PAN-OS 10.2.9",
"PAN-OS 10.2.8-h21",
"PAN-OS 10.2.8-h20",
"PAN-OS 10.2.8-h19",
"PAN-OS 10.2.8-h18",
"PAN-OS 10.2.8-h17",
"PAN-OS 10.2.8-h16",
"PAN-OS 10.2.8-h15",
"PAN-OS 10.2.8-h14",
"PAN-OS 10.2.8-h13",
"PAN-OS 10.2.8-h12",
"PAN-OS 10.2.8-h11",
"PAN-OS 10.2.8-h10",
"PAN-OS 10.2.8-h9",
"PAN-OS 10.2.8-h8",
"PAN-OS 10.2.8-h7",
"PAN-OS 10.2.8-h6",
"PAN-OS 10.2.8-h5",
"PAN-OS 10.2.8-h4",
"PAN-OS 10.2.8-h3",
"PAN-OS 10.2.8-h2",
"PAN-OS 10.2.8-h1",
"PAN-OS 10.2.8",
"PAN-OS 10.2.7-h32",
"PAN-OS 10.2.7-h24",
"PAN-OS 10.2.7-h23",
"PAN-OS 10.2.7-h22",
"PAN-OS 10.2.7-h21",
"PAN-OS 10.2.7-h20",
"PAN-OS 10.2.7-h19",
"PAN-OS 10.2.7-h18",
"PAN-OS 10.2.7-h17",
"PAN-OS 10.2.7-h16",
"PAN-OS 10.2.7-h15",
"PAN-OS 10.2.7-h14",
"PAN-OS 10.2.7-h13",
"PAN-OS 10.2.7-h12",
"PAN-OS 10.2.7-h11",
"PAN-OS 10.2.7-h10",
"PAN-OS 10.2.7-h9",
"PAN-OS 10.2.7-h8",
"PAN-OS 10.2.7-h7",
"PAN-OS 10.2.7-h6",
"PAN-OS 10.2.7-h5",
"PAN-OS 10.2.7-h4",
"PAN-OS 10.2.7-h3",
"PAN-OS 10.2.7-h2",
"PAN-OS 10.2.7-h1",
"PAN-OS 10.2.7",
"PAN-OS 10.2.6-h6",
"PAN-OS 10.2.6-h5",
"PAN-OS 10.2.6-h4",
"PAN-OS 10.2.6-h3",
"PAN-OS 10.2.6-h2",
"PAN-OS 10.2.6-h1",
"PAN-OS 10.2.6",
"PAN-OS 10.2.5-h9",
"PAN-OS 10.2.5-h8",
"PAN-OS 10.2.5-h7",
"PAN-OS 10.2.5-h6",
"PAN-OS 10.2.5-h5",
"PAN-OS 10.2.5-h4",
"PAN-OS 10.2.5-h3",
"PAN-OS 10.2.5-h2",
"PAN-OS 10.2.5-h1",
"PAN-OS 10.2.5",
"PAN-OS 10.2.4-h32",
"PAN-OS 10.2.4-h31",
"PAN-OS 10.2.4-h30",
"PAN-OS 10.2.4-h29",
"PAN-OS 10.2.4-h28",
"PAN-OS 10.2.4-h27",
"PAN-OS 10.2.4-h26",
"PAN-OS 10.2.4-h25",
"PAN-OS 10.2.4-h24",
"PAN-OS 10.2.4-h23",
"PAN-OS 10.2.4-h22",
"PAN-OS 10.2.4-h21",
"PAN-OS 10.2.4-h20",
"PAN-OS 10.2.4-h19",
"PAN-OS 10.2.4-h18",
"PAN-OS 10.2.4-h17",
"PAN-OS 10.2.4-h16",
"PAN-OS 10.2.4-h15",
"PAN-OS 10.2.4-h14",
"PAN-OS 10.2.4-h13",
"PAN-OS 10.2.4-h12",
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"PAN-OS 10.2.4-h9",
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"PAN-OS 10.2.4-h7",
"PAN-OS 10.2.4-h6",
"PAN-OS 10.2.4-h5",
"PAN-OS 10.2.4-h4",
"PAN-OS 10.2.4-h3",
"PAN-OS 10.2.4-h2",
"PAN-OS 10.2.4-h1",
"PAN-OS 10.2.4",
"PAN-OS 10.2.3-h14",
"PAN-OS 10.2.3-h13",
"PAN-OS 10.2.3-h12",
"PAN-OS 10.2.3-h11",
"PAN-OS 10.2.3-h10",
"PAN-OS 10.2.3-h9",
"PAN-OS 10.2.3-h8",
"PAN-OS 10.2.3-h7",
"PAN-OS 10.2.3-h6",
"PAN-OS 10.2.3-h5",
"PAN-OS 10.2.3-h4",
"PAN-OS 10.2.3-h3",
"PAN-OS 10.2.3-h2",
"PAN-OS 10.2.3-h1",
"PAN-OS 10.2.3",
"PAN-OS 10.2.2-h6",
"PAN-OS 10.2.2-h5",
"PAN-OS 10.2.2-h4",
"PAN-OS 10.2.2-h3",
"PAN-OS 10.2.2-h2",
"PAN-OS 10.2.2-h1",
"PAN-OS 10.2.2",
"PAN-OS 10.2.1-h3",
"PAN-OS 10.2.1-h2",
"PAN-OS 10.2.1-h1",
"PAN-OS 10.2.1",
"PAN-OS 10.2.0-h4",
"PAN-OS 10.2.0-h3",
"PAN-OS 10.2.0-h2",
"PAN-OS 10.2.0-h1",
"PAN-OS 10.2.0"
],
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
}
},
"cveMetadata": {
"assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0",
"assignerShortName": "palo_alto",
"cveId": "CVE-2026-0300",
"datePublished": "2026-05-06T18:57:39.876Z",
"dateReserved": "2025-11-03T20:44:58.173Z",
"dateUpdated": "2026-06-09T09:02:50.781Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2026-0300",
"cwes": "[\"CWE-787\"]",
"dateAdded": "2026-05-06",
"dueDate": "2026-05-09",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300",
"product": "PAN-OS",
"requiredAction": "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.",
"shortDescription": "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.",
"vendorProject": "Palo Alto Networks",
"vulnerabilityName": "Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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