CVE-2026-0256Network attack vector

Authenticated JavaScript execution via stored web payload

Published May 13, 2026 · Updated May 13, 2026

Stored XSS in Palo Alto Networks PAN-OS 10.2, 11.1, 11.2, and 12.1 allows remote authenticated users to persist JavaScript through the web interface. Palo Alto Networks has not disclosed the affected input field or the server-side neutralization failure that permits the payload to remain stored and execute when another user renders the affected interface content. Administrator privileges and passive interaction by a second user are required, enabling access to browser-visible data and modification of actions within the interface.

CVSS severity6.9
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Palo Alto Networks PAN-OS 10.2, 11.1, 11.2, and 12.1 allows remote authenticated users to persist JavaScript through the web interface. Palo Alto Networks has not disclosed the affected input field or the server-side neutralization failure that permits the payload to remain stored and execute when another user renders the affected interface content. Administrator privileges and passive interaction by a second user are required, enabling access to browser-visible data and modification of actions within the interface.

The record

CVE
CVE-2026-0256
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Palo Alto Networks
Product
PAN-OS
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

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

Published CVSS scores

4.4Palo Alto NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
6.9Palo Alto NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

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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