CVE-2026-0265Network attack vector

Authentication bypass via improper CAS signature verification

Published May 13, 2026 · Updated May 13, 2026

Authentication bypass in Palo Alto Networks PAN-OS 10.2, 11.1, 11.2, and 12.1 allows remote attackers to bypass login controls. The CAS authentication path improperly verifies a cryptographic signature, but Palo Alto Networks has not disclosed the specific message, token, or code locus involved. Exposure requires a CAS authentication profile attached to a login interface; successful exploitation grants that interface's protected access, with management access posing the greatest risk.

CVSS severity9.2
Critical
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Palo Alto Networks PAN-OS 10.2, 11.1, 11.2, and 12.1 allows remote attackers to bypass login controls. The CAS authentication path improperly verifies a cryptographic signature, but Palo Alto Networks has not disclosed the specific message, token, or code locus involved. Exposure requires a CAS authentication profile attached to a login interface; successful exploitation grants that interface's protected access, with management access posing the greatest risk.

The record

CVE
CVE-2026-0265
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Palo Alto Networks
Product
PAN-OS
Classifications
CWE-347, CAPEC-115, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.2.0 <10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34 changes=[{"at":"10.2.7-h34","status":"unaffected"},{"at":"10.2.10-h36","status":"unaffected"},{"at":"10.2.13-h21","status":"unaffected"},{"at":"10.2.16-h7","status":"unaffected"},{"at":"10.2.18-h6","status":"unaffected"}]
  2. Affected versionversion=11.1.0 <11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33 changes=[{"at":"11.1.4-h33","status":"unaffected"},{"at":"11.1.6-h32","status":"unaffected"},{"at":"11.1.7-h6","status":"unaffected"},{"at":"11.1.10-h25","status":"unaffected"},{"at":"11.1.13-h5","status":"unaffected"},{"at":"11.1.15","status":"unaffected"}]
  3. Affected versionversion=11.2.0 <11.2.12, 11.2.10-h6, 11.2.7-h13, 11.2.4-h17 changes=[{"at":"11.2.4-h17","status":"unaffected"},{"at":"11.2.7-h13","status":"unaffected"},{"at":"11.2.10-h6","status":"unaffected"},{"at":"11.2.12","status":"unaffected"}]
  4. Affected versionversion=12.1.0 <12.1.7, 12.1.4-h5 changes=[{"at":"12.1.4-h5","status":"unaffected"},{"at":"12.1.7","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Palo Alto Networks · PAN-OSversion=10.2.0 <10.2.18-h6, 10.2.16-h7, 10.2.13-h21, 10.2.10-h36, 10.2.7-h34 changes=[{"at":"10.2.7-h34","status":"unaffected"},{"at":"10.2.10-h36","status":"unaffected"},{"at":"10.2.13-h21","status":"unaffected"},{"at":"10.2.16-h7","status":"unaffected"},{"at":"10.2.18-h6","status":"unaffected"}]; version=11.1.0 <11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33 changes=[{"at":"11.1.4-h33","status":"unaffected"},{"at":"11.1.6-h32","status":"unaffected"},{"at":"11.1.7-h6","status":"unaffected"},{"at":"11.1.10-h25","status":"unaffected"},{"at":"11.1.13-h5","status":"unaffected"},{"at":"11.1.15","status":"unaffected"}]; version=11.2.0 <11.2.12, 11.2.10-h6, 11.2.7-h13, 11.2.4-h17 changes=[{"at":"11.2.4-h17","status":"unaffected"},{"at":"11.2.7-h13","status":"unaffected"},{"at":"11.2.10-h6","status":"unaffected"},{"at":"11.2.12","status":"unaffected"}]; version=12.1.0 <12.1.7, 12.1.4-h5 changes=[{"at":"12.1.4-h5","status":"unaffected"},{"at":"12.1.7","status":"unaffected"}]

Published CVSS scores

9.2Palo Alto NetworksCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.2Palo Alto NetworksCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
CAPEC-115Authentication Bypass
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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