vulnerability

CVE-2026-0257

9.1

Critical

KEV · Exploited in wildEPSS 96%Patch available

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.

exploited

Yes, in CISA KEV since 29 May 2026fix by 1 Jun 2026 (CISA deadline for US federal agencies)known use in ransomware campaignsunvetted proof-of-concept code on github

fix

Patch available see the advisory in the references

likelihood

EPSS 95.6%

Published 13 May 2026Analysed here 2 Nov 2026

do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

triage

surface unknownruntimeWAF can block: partlyAV · networkCWE-565· Common Weakness

Can a WAF block it? Partly. The bug can be reached over the network, so generic WAF rules may stop some attacks. Its weakness type is unknown, so we cannot be more precise.

Also consider: patch

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector

attack vectornetworkattack complexitylowprivileges requirednoneuser interactionnonescopeunchangedconfidentialityhighintegrityhighavailabilitynone

CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

common questions

Is CVE-2026-0257 being exploited?

Yes. CVE-2026-0257 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2026-0257?

CVE-2026-0257 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-0257?

Yes. A fix has been recorded for CVE-2026-0257. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-0257 affect?

CVE-2026-0257 affects paloaltonetworks:pan-os, paloaltonetworks:prisma_access, siemens:ruggedcom_ape1808_firmware. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary

technical analysis

affected

paloaltonetworks:pan-ospaloaltonetworks:prisma_accesssiemens:ruggedcom_ape1808_firmware

affected versions

Palo Alto Networks PAN-OS

affected>= 12.1.0 and < 12.1.7, 12.1.4-h6
affected>= 11.2.0 and < 11.2.12, 11.2.10-h7, 11.2.7-h14, 11.2.4-h17
affected>= 11.1.0 and < 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33
affected>= 10.2.0 and < 10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34

Palo Alto Networks Prisma Access

affected>= 10.2.0 and < 10.2.10-h36
affected>= 11.2.0 and < 11.2.7-h13

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

public exploits

Unvetted proof-of-concept code on GitHub: 7 GitHub proofs of concept · 1 Nuclei template

Nuclei

Palo Alto Networks PAN-OS - Authentication Bypass · detection template · critical

GitHub proofs of concept

+3 more repositories

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

cisa ssvc

exploitation: active
automatable: no
technical impact: total

Assessed by CISA 28 May 2026 (SSVC 2.0.3).

timeline

13 May 2026Published
28 May 2026CISA SSVC assessment: exploitation active · 14 days later
29 May 2026Added to CISA KEV (exploited in the wild) · 1 day later
29 May 2026First proof-of-concept repository on GitHub (unvetted) · same day later
1 Jun 2026CISA remediation due date (US federal agencies) · 3 days later
15 Oct 2026CVE record last updated · 136 days (about 5 months) later
2 Nov 2026Analysed by vulneraibility.com · 19 days later

how to fix

Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.

references

NVD CVE.org CVE Details Source

3 references in the CVE record: 1 advisory, 2 links

Advisorysecurity.paloaltonetworks.com /CVE-2026-0257
Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257
Linkcert-portal.siemens.com /productcert/html/ssa-967325.html

sources

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA KEV catalog: exploitation, date added, due date
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Nuclei templates: detection templates
PoC-in-GitHub: GitHub repositories that claim a proof of concept
Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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