Palo Alto Cloud NGFW/PAN-OS/Prisma Access GlobalProtect Portal cookie validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.2$0-$5k2.07

Summaryinfo

A vulnerability classified as critical has been found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access. This vulnerability affects unknown code of the component GlobalProtect Portal. Performing a manipulation results in cookie validation. This vulnerability was named CVE-2026-0257. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access (version now known). This affects some unknown processing of the component GlobalProtect Portal. The manipulation with an unknown input leads to a cookie validation vulnerability. CWE is classifying the issue as CWE-565. The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at security.paloaltonetworks.com. This vulnerability is uniquely identified as CVE-2026-0257 since 11/03/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/02/2026).

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/29/2026 with a due date of 06/01/2026:

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

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30104). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.1
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cookie validation
CWE: CWE-565 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Attacked

EPSS Score: 🔒
EPSS Percentile: 🔒

KEV Added: 🔒
KEV Due: 🔒
KEV Remediation: 🔒
KEV Ransomware: 🔒
KEV Notice: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/03/2025 CVE reserved
05/13/2026 +190 days Advisory disclosed
05/13/2026 +0 days VulDB entry created
06/02/2026 +20 days VulDB entry last update

Sourcesinfo

Vendor: paloaltonetworks.com

Advisory: security.paloaltonetworks.com
Status: Confirmed

CVE: CVE-2026-0257 (🔒)
GCVE (CVE): GCVE-0-2026-0257
GCVE (VulDB): GCVE-100-363663
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/13/2026 20:42
Updated: 06/02/2026 08:19
Changes: 05/13/2026 20:42 (70), 05/13/2026 23:13 (1), 06/01/2026 05:49 (13), 06/02/2026 08:19 (14)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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