Palo Alto Cloud NGFW/PAN-OS/Prisma Access certificate validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access. This affects an unknown part. This manipulation causes certificate validation. The identification of this vulnerability is CVE-2026-0228. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access (version now known). It has been declared as problematic. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. The summary by CVE is:

An improper certificate validation vulnerability in PAN-OS allows users to connect Terminal Server Agents on Windows to PAN-OS using expired certificates even if the PAN-OS configuration would not normally permit them to do so.

The weakness was shared by Paolo Nero. The advisory is shared at security.paloaltonetworks.com. This vulnerability is known as CVE-2026-0228 since 11/03/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/13/2026). MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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
02/11/2026 +100 days Advisory disclosed
02/11/2026 +0 days VulDB entry created
02/13/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: paloaltonetworks.com

Advisory: security.paloaltonetworks.com
Researcher: Paolo Nero
Status: Confirmed

CVE: CVE-2026-0228 (🔒)
GCVE (CVE): GCVE-0-2026-0228
GCVE (VulDB): GCVE-100-345589

Entryinfo

Created: 02/11/2026 22:35
Updated: 02/13/2026 02:06
Changes: 02/11/2026 22:35 (71), 02/13/2026 02:06 (1)
Complete: 🔍
Cache ID: 216::103

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