Security readout for executives and security teams
Plain-English summary
CVE-2026-0257 lets an unauthenticated attacker bypass GlobalProtect VPN authentication on affected Palo Alto Networks PAN-OS systems and create an unauthorized VPN connection. This is high business urgency because VPN access can become a direct path into internal networks. CISA lists it in KEV, indicating known exploitation.
Executive priority
Treat as urgent for any exposed GlobalProtect deployment. The issue can allow unauthorized VPN access, and CISA KEV listing indicates real-world exploitation. Confirm exposure today, follow vendor remediation guidance, and monitor VPN activity closely.
Technical view
The flaw is an authentication bypass in PAN-OS GlobalProtect portal and gateway, mapped to CWE-565. CVSS v4.0 is 7.8, with network attack vector, low complexity, no privileges, and no user interaction. Panorama and Cloud NGFW are reported not impacted. The provided sources do not name fixed releases or detailed indicators.
Likely exposure
Organizations running PAN-OS with GlobalProtect portal or gateway enabled are the primary exposure. Internet-facing VPN services are highest priority. Panorama and Cloud NGFW are stated as not impacted; Prisma Access is listed as unaffected in the provided bundle.
Exploitation context
CISA KEV status supports active exploitation. Sources do not provide exploit details, public proof-of-concept status, attacker identity, or indicators. Treat exposed GlobalProtect VPN services as urgent until vendor guidance confirms they are fixed or otherwise protected.
Researcher notes
The bundle identifies affected PAN-OS/GlobalProtect context, CVSS vector, CWE-565, and KEV status. It does not include fixed versions, workarounds, exploit mechanics, or detection indicators. Avoid assuming impact beyond PAN-OS GlobalProtect unless the vendor advisory confirms it.
Mitigation direction
- Review Palo Alto Networks advisory for affected and fixed PAN-OS releases.
- Prioritize GlobalProtect portal and gateway systems exposed to the internet.
- Apply vendor-recommended updates or mitigations when identified.
- Review Siemens advisory if Siemens guidance applies to your environment.
- Increase monitoring for unexpected VPN sessions and authentication anomalies.
Validation and detection
- Inventory PAN-OS firewalls with GlobalProtect portal or gateway enabled.
- Confirm exact PAN-OS version and hotfix level against vendor advisory.
- Verify Panorama and Cloud NGFW are not misclassified as affected assets.
- Check VPN logs for unfamiliar users, source locations, or session patterns.
- Track CISA KEV remediation expectations for this CVE.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-565: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-0257 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (4.0)
- Known Exploited
- Yes
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red——palo_altoVulnerability scoring details
Base CVSS 4.0 score
7.8HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelinepalo_alto
Initial publication.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2026-0257 added to CISA KEV
- Source timelinepalo_alto
Updated exploitation status.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-05-29T00:00:00.000Z: CVE-2026-0257 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://security.paloaltonetworks.com/CVE-2026-0257CVE reference, palo_alto · vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257CVE reference, CISA-ADP · government-resource
- https://cert-portal.siemens.com/productcert/html/ssa-967325.htmlCVE reference, siemens-SADP
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Reliance on Cookies without Validation and Integrity Checking
Reliance on Cookies without Validation and Integrity Checking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.