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Response snapshot Oct 26, 2026, 18:57 UTC

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VulnerabilityCVE-2026-0257Known exploitation

Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Ravie Lakshmanan reports: Palo Alto Networks has disclosed that it’s continuing to observe exploitation of a now-patched security flaw impacting PAN-OS and Prisma Access by ransomware actors. The activity relates to CVE-2026-0257 (CVSS score: 7.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
7.8 High (CVSS 4.0)
Chance of exploitation
95.0% in the next 30 days
CISA federal deadline
Jun 1, 2026: passed
Sources
4 independent sources

What to do

Check the vendor advisory linked from the article for affected versions and fixes.

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

Read NVD CVE-2026-0257 (opens a new tab)

What happened

Ravie Lakshmanan reports: Palo Alto Networks has disclosed that it’s continuing to observe exploitation of a now-patched security flaw impacting PAN-OS and Prisma Access by ransomware actors. The activity relates to CVE-2026-0257 (CVSS score: 7.8), an authentication bypass flaw that could be exploited by bad actors to set up unauthorized VPN connections. It was patched... Source

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Known
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

7.8

Version 4.0As of

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:M/U:Red

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

95.0%

Scored Percentile 99.9%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Reporting

    DataBreaches.net: Qilin and INC Ransomware Groups Exploit Palo Alto Networks Flaw to Bypass MFA (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  2. Reporting

    DataBreaches.net syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE-2026-0257 (opens a new tab)

    NVD record: description, CVSS, affected products, and a CISA SSVC assessment reporting active exploitation.

    Published Checked

  4. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  5. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  6. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  7. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  8. Primary source

    CISA KEV entry CVE-2026-0257 (opens a new tab)

    The CVE-2026-0257 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  9. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-0257, scored 2026-10-25. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 26). Palo Alto Networks PAN-OS Authentication Bypass Vulnerability (CVE-2026-0257). https://kevwire.com/record/CVE-2026-0257

MLA

"Palo Alto Networks PAN-OS Authentication Bypass Vulnerability (CVE-2026-0257)." KEVWire, 26 Oct. 2026, kevwire.com/record/CVE-2026-0257.

Chicago

KEVWire. "Palo Alto Networks PAN-OS Authentication Bypass Vulnerability (CVE-2026-0257)." Last modified October 26, 2026. https://kevwire.com/record/CVE-2026-0257.

Evidence summary (plain text)

Palo Alto Networks PAN-OS Authentication Bypass Vulnerability (Oct 20, 2026).
Ravie Lakshmanan reports: Palo Alto Networks has disclosed that it’s continuing to observe exploitation of a now-patched security flaw impacting PAN-OS and Prisma Access by ransomware actors. The activity relates to CVE-2026-0257 (CVSS score: 7.8), an authentication bypass flaw that could be exploited by bad actors to set up unauthorized VPN connections. It was patched...
 Source
CVSS 7.8 (version 4.0; evidence as of Oct 26, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-0257).
EPSS 95.0% for the following 30 days, scored Oct 25, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-0257&date=2026-10-25).
Sources:
DataBreaches.net: Qilin and INC Ransomware Groups Exploit Palo Alto Networks Flaw to Bypass MFA: https://databreaches.net/2026/10/20/qilin-and-inc-ransomware-groups-exploit-palo-alto-networks-flaw-to-bypass-mfa/
DataBreaches.net syndication feed: https://databreaches.net/feed/
NVD CVE-2026-0257: https://nvd.nist.gov/vuln/detail/CVE-2026-0257
Vendor advisory (via NVD references): https://security.paloaltonetworks.com/CVE-2026-0257
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T13:46:51.330Z&lastModEndDate=2026-10-26T15:20:55.429Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T13:11:54.490Z&lastModEndDate=2026-10-26T14:45:57.368Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T12:40:01.998Z&lastModEndDate=2026-10-26T14:10:55.205Z&resultsPerPage=500&startIndex=0
CISA KEV entry CVE-2026-0257: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-0257&date=2026-10-25
Record ID: CVE-2026-0257.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Jun 1, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 13:40 UTC. Ingestion is not an independent editorial investigation.

Syndicated reporting, unreviewed by KEVWire and not independently primary-confirmed. Consult the exact article and any primary disclosure it links.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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