Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-05-06. Ransomware campaign use: Unknown.
CISA 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.
CISA due date: 2026-05-09. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Palo Alto Networks / Cloud NGFW
Default status: unaffected
- unaffected: All (custom)
Palo Alto Networks / PAN-OS
Default status: unaffected
- affected: 12.1.0 to < 12.1.7 (custom)
- At 12.1.7: unaffected
- At 12.1.4-h5: unaffected
- affected: 11.2.0 to < 11.2.12 (custom)
- At 11.2.12: unaffected
- At 11.2.10-h6: unaffected
- At 11.2.7-h13: unaffected
- At 11.2.4-h17: unaffected
- affected: 11.1.0 to < 11.1.15 (custom)
- At 11.1.15: unaffected
- At 11.1.13-h5: unaffected
- At 11.1.10-h25: unaffected
- At 11.1.7-h6: unaffected
- At 11.1.6-h32: unaffected
- At 11.1.4-h33: unaffected
- affected: 10.2.0 to < 10.2.18-h6 (custom)
- At 10.2.18-h6: unaffected
- At 10.2.16-h7: unaffected
- At 10.2.13-h21: unaffected
- At 10.2.10-h36: unaffected
- At 10.2.7-h34: unaffected
Palo Alto Networks / Prisma Access
Default status: unaffected
- unaffected: All (custom)
Fixes and workarounds
This issue will be fixed in upcoming releases of PAN-OS as captured in the table above. We strongly recommend that you secure access to your User-ID™ Authentication Portal following the instructions in the workarounds section below.
Reported workarounds: Customers can mitigate the risk of this issue by taking either of the following actions: * Restrict User-ID™ 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' 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. * Disable User-ID™ Authentication Portal if not required. Customers 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.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.41714,
"percentile": 0.98706
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.41714,
"percentile": 0.98698
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.41714,
"percentile": 0.98696
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.41714,
"percentile": 0.98695
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.41714,
"percentile": 0.98694
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.41714,
"percentile": 0.98692
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.41714,
"percentile": 0.98691
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.41714,
"percentile": 0.9869
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.41714,
"percentile": 0.98688
}03 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-0300",
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"lang": "en",
"time": "2026-05-06T00:00:00.000Z",
"value": "CVE-2026-0300 added to CISA KEV"
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"title": "CISA ADP Vulnrichment"
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],
"providerMetadata": {
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],
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],
"value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\n\nWe strongly recommend that you secure access to your User-ID™ Authentication Portal following the instructions in the workarounds section below."
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],
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"value": "Updated with Threat Prevention ID and clarified the Required Configuration section."
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{
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"title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal",
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}
],
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"PAN-OS 10.2.18-h1",
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"PAN-OS 10.2.9-h21",
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"PAN-OS 10.2.9-h6",
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"PAN-OS 10.2.8-h6",
"PAN-OS 10.2.8-h5",
"PAN-OS 10.2.8-h4",
"PAN-OS 10.2.8-h3",
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"PAN-OS 10.2.8",
"PAN-OS 10.2.7-h32",
"PAN-OS 10.2.7-h24",
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"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",
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"PAN-OS 10.2.7-h15",
"PAN-OS 10.2.7-h14",
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"PAN-OS 10.2.3-h14",
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"PAN-OS 10.2.3-h11",
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"PAN-OS 10.2.3-h9",
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"PAN-OS 10.2.3-h4",
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"PAN-OS 10.2.3",
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"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": "2026-10-15T01:11:55.163Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.41714,
"percentile": 0.98686
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-0300",
"cwes": [
"CWE-787"
],
"dateAdded": "2026-05-06",
"dueDate": "2026-05-09",
"forensicTriage": "No",
"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"
}