CVE-2026-0266: A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenti

Q: How do I fix CVE-2026-0266?

pan-os: upgrade to 11.1.14, 11.2.11, 12.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-0266 being exploited?

CVE-2026-0266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-0266 affect?

CVE-2026-0266 affects pan-os. Severity is medium (CVSS 4.8). A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store a JavaScript payload using the web interface. This issue is applicable to PAN-OS software on PA-Ser

Q: How urgent is CVE-2026-0266?

Priority 18/100. No elevated risk signals yet.

Routine

MEDIUM 4.8UPGRADE

CVE-2026-0266 is a medium-severity flaw (CVSS 4.8) affecting pan-os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store a JavaScript payload using the web interface. This issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama (virtual and M-Series). Cloud NGFW and Prisma® Access are not affected by this vulnerability.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-10
Last modified	2026-07-23

Publisher (CNA): Palo Alto Networks, Inc. · Vendor: paloaltonetworks

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 22:16 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

paloaltonetworks pan-os UPGRADE

Affected: >= 10.2.0 and < 11.1.14 · >= 11.2.0 and < 11.2.11 · >= 12.1.0 and < 12.1.5

Fixed in: 11.1.14, 11.2.11, 12.1.5

Safe to downgrade to: a release before 10.2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-0266?

pan-os: upgrade to 11.1.14, 11.2.11, 12.1.5. Exact commands for each OS are on this page.

Is CVE-2026-0266 being exploited?

CVE-2026-0266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0266 affect?

CVE-2026-0266 affects pan-os. Severity is medium (CVSS 4.8). A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store a JavaScript payload using the web interface. This issue is applicable to PAN-OS software on PA-Ser

How urgent is CVE-2026-0266?

Priority 18/100. No elevated risk signals yet.

Software pages

Palo Alto PAN-OS vulnerabilities

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References

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