CVE-2026-0228PAN-OS: Improper Validation of Terminal Server Agent Certificate
- 1.3LowCVSS base score
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By palo_alto
- 3 months later
· 3 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| palo_altoCNA (assigner) | 4.0 | Low1.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber |
| NVDNVD · Deferred | 4.0 | Low1.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N/E:U/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:U/V:D/RE:M/U:Amber |
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 1.3.
Affected products
Palo Alto Networks · Cloud NGFW
- unaffected All
- unaffected 12.1.0 – < 11.2.8
- affected 11.2.0 – < 11.2.8
- affected 11.1.0 – < 11.1.11
- affected 10.2.0 – < 10.2.17
Palo Alto Networks · Prisma Access
- affected 10.2.0 – < 10.2.10-h28
What to do
Solution: VERSION MINOR VERSION SUGGESTED SOLUTION Cloud NGFW No action needed. PAN-OS 12.1 No action needed. PAN-OS 11.2 11.2.0 through 11.2.7 Upgrade to 11.2.8 or later. PAN-OS 11.1 11.1.0 through 11.1.10 Upgrade to 11.1.11 or later. PAN-OS 10.2 10.2.0 through 10.2.16 Upgrade to 10.2.17 or later. All older Upgrade to a supported fixed version. unsupported PAN-OS versions Prisma Access 11.2 on PAN-OS 11.2.0 through 11.2.7 Upgrade to 11.2.7-h10 or later. Prisma Access 10.2 on PAN-OS 10.2.0 through 10.2.10 Upgrade to 10.2.10-h28 or later.
Workaround: No known workarounds exist for this issue.
Exploitation: Palo Alto Networks is not aware of any malicious exploitation of this issue.
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-5939 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-0228)Record last updated .