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PatchSiren cyber security CVE debrief

CVE-2026-78902 Netgate CVE debrief

A Cross Site Scripting vulnerability exists in Netgate pfSense 26.03.1-RELEASE, which could potentially allow an attacker to execute arbitrary code via the pfBlockerNG package. The CVE record was published on 2026-09-25T13:17:16.170Z and has not been modified since then. The NVD entry is currently 6.1, MEDIUM. This vulnerability affects pfSense installations using the pfBlockerNG package, and defenders should assess exposure and verify exploitation feasibility. The CVE record and NVD detail page provide information, but further verification is needed to confirm affected versions and remediation. Confirm whether affected product deployments exist in managed environments and assign a

Vendor
Netgate
Product
pfSense 26.03.1-RELEASE
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-25
Original CVE updated
2026-09-25
Advisory published
2026-09-25
Advisory updated
2026-09-25

Who should care

Defenders responsible for pfSense installations, particularly those using the pfBlockerNG package, should assess exposure and verify the feasibility of exploitation.

Why it matters

Defenders should prioritize verifying exposure of pfSense installations to this vulnerability and assess the feasibility of exploitation, as it could potentially allow an attacker to execute arbitrary code via the pfBlockerNG package.

  • Verify exposure of pfSense installations to this vulnerability
  • Assess the feasibility of exploitation
  • Review pfBlockerNG package configurations

Technical summary

The CVE record describes a Cross Site Scripting vulnerability in Netgate pfSense 26.03.1-RELEASE, which could potentially allow an attacker to execute arbitrary code via the pfBlockerNG package. The vulnerability has a CVSS score of 6.1 and is classified as MEDIUM.

Defensive priority

Defenders should prioritize verifying exposure of pfSense installations to this vulnerability and assess the feasibility of exploitation.

Recommended defensive actions

  • Verify pfSense installations for exposure to this vulnerability
  • Assess the feasibility of exploitation
  • Review pfBlockerNG package configurations

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but further verification is needed to confirm affected versions and remediation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78902 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78902

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-78902 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78902

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.netspi.com/blog/technical-blog/web-application-pentesting/cve-2026-78902-xss-to-rce-in-pfsense-with-one-dns-request/

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.