CVE-2026-0257 — Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
paloaltonetworks	pan	os — < 10.2.7
paloaltonetworks	pan	os — 10.2.7
paloaltonetworks	pan	os — 10.2.8
paloaltonetworks	pan	os — 10.2.9
paloaltonetworks	pan	os — 10.2.10
paloaltonetworks	pan	os — 10.2.11
paloaltonetworks	pan	os — 10.2.12
paloaltonetworks	pan	os — 10.2.13
paloaltonetworks	pan	os — 10.2.14
paloaltonetworks	pan	os — 10.2.15
paloaltonetworks	pan	os — 10.2.16
paloaltonetworks	pan	os — 10.2.17
paloaltonetworks	pan	os — 10.2.18
paloaltonetworks	pan	os — 11.1.0
paloaltonetworks	pan	os — 11.1.1
paloaltonetworks	pan	os — 11.1.2
paloaltonetworks	pan	os — 11.1.3
paloaltonetworks	pan	os — 11.1.4
paloaltonetworks	pan	os — 11.1.5
paloaltonetworks	pan	os — 11.1.6
paloaltonetworks	pan	os — 11.1.7
paloaltonetworks	pan	os — 11.1.8
paloaltonetworks	pan	os — 11.1.9
paloaltonetworks	pan	os — 11.1.10
paloaltonetworks	pan	os — 11.1.11
paloaltonetworks	pan	os — 11.1.12
paloaltonetworks	pan	os — 11.1.13
paloaltonetworks	pan	os — 11.1.14
paloaltonetworks	pan	os — 11.2.0
paloaltonetworks	pan	os — 11.2.1
paloaltonetworks	pan	os — 11.2.2
paloaltonetworks	pan	os — 11.2.3
paloaltonetworks	pan	os — 11.2.4
paloaltonetworks	pan	os — 11.2.5
paloaltonetworks	pan	os — 11.2.6
paloaltonetworks	pan	os — 11.2.7
paloaltonetworks	pan	os — 11.2.8
paloaltonetworks	pan	os — 11.2.9
paloaltonetworks	pan	os — 11.2.10
paloaltonetworks	pan	os — 11.2.11
paloaltonetworks	pan	os — 12.1.2
paloaltonetworks	pan	os — 12.1.3
paloaltonetworks	pan	os — 12.1.4
paloaltonetworks	pan	os — 12.1.5
paloaltonetworks	pan	os — 12.1.6
paloaltonetworks	prisma_access	unspecified
siemens	ruggedcom_ape1808_firmware	unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2026-05-29. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-05-13T19:17:01.040
• Last modified: 2026-10-26T14:10:00.130
• Added to CISA KEV: 2026-05-29
• BOD 22-01 due: 2026-06-01

09References

• security.paloaltonetworks.com — https://security.paloaltonetworks.com/CVE-2026-0257
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-967325.html
• www.cisa.gov — https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-…