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CVE-2026-0300

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 r
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6767840019940f8a80a51de9a37823647726237083cb8c924020f2c30e0b20e1
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"defaultStatus":"unaffected","product":"Cloud NGFW","vendor":"Palo Alto Networks","versions":[{"status":"unaffected","version":"All","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"RUGGEDCOM APE1808","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/adp/1/affected/0

{"cpes":["cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.5:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:h3:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:h2:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:-:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.3:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.2:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.11:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:h4:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:h3:*:*:*:*…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Prisma Access","vendor":"Palo Alto Networks","versions":[{"status":"unaffected","version":"All","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/2
cvss · 2 assertions

{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"ATTACKED","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"CONCENTRATED","vectorString":"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/AU:Y/R:U/V:C/RE:M/U:Red","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpa…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"ADJACENT","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"ATTACKED","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"CONCENTRATED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/metrics/1/cvssV4_0

Affected products and versions

4 source assertions
{"defaultStatus":"unaffected","product":"Cloud NGFW","vendor":"Palo Alto Networks","versions":[{"status":"unaffected","version":"All","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"RUGGEDCOM APE1808","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/adp/1/affected/0
{"cpes":["cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.5:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:h3:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:h2:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:-:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.3:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:12.1.2:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.11:*:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:h4:*:*:*:*:*:*","cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:h3:*:*:*:*…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Prisma Access","vendor":"Palo Alto Networks","versions":[{"status":"unaffected","version":"All","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/affected/2

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"ATTACKED","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"CONCENTRATED","vectorString":"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/AU:Y/R:U/V:C/RE:M/U:Red","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpa…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"ADJACENT","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"ATTACKED","privilegesRequired":"NONE","providerUrgency":"RED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"CONCENTRATED","vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/metrics/1/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/problemTypes/0/descriptions/0

Known exploitation assertions

2 source assertions
{"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-…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:a978c23abd49799b74e253e03d9837432f381c9bf124fac7db6d95cf527a9d3a · sha256:635dff916c4092c0… · /vulnerabilities/72
    Open source location →
{"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-…
  • cisa_kev_jsonknown_exploited
    urn:baitaphish:normalized-source-record:v2:417157a261211db256d5a1b55c5e2cc5ed4f8f359f4fc792ac6b5dbd7af49628 · sha256:16acee8334e59e44… · /vulnerabilities/69
    Open source location →

Source references

3 source assertions
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-967325.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/adp/1/references/0
{"tags":["vendor-advisory"],"url":"https://security.paloaltonetworks.com/CVE-2026-0300"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:428dbbea2484b23edff633c71ca9b8d9c191635e1c10f763fb0f8d869d9905cc · sha256:cc2e4a01336be7b6… · /containers/adp/0/references/0

Attribution and limitations

  • CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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