CVE-2026-78902Public exploitNetwork attack vector

Root command execution via unescaped DNS reply logs

Published Sep 25, 2026 · Updated Sep 25, 2026

Stored XSS in Netgate pfBlockerNG before 3.2.16_1 allows remote attackers to execute commands as root through a crafted DNS reply. The pfb_unbound.py convert_other() path preserves metacharacters and writes raw DNS RDATA to dns_reply.log, while pfblockerng_alerts.php renders the value without HTML escaping. Exploitation requires Unbound Python mode with DNS reply logging, a client query through the resolver, and an administrator to view the Reports Stats page.

CVSS severityUnavailable
Unscored
EPSS probability0.30%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Netgate pfBlockerNG before 3.2.16_1 allows remote attackers to execute commands as root through a crafted DNS reply. The pfb_unbound.py convert_other() path preserves metacharacters and writes raw DNS RDATA to dns_reply.log, while pfblockerng_alerts.php renders the value without HTML escaping. Exploitation requires Unbound Python mode with DNS reply logging, a client query through the resolver, and an administrator to view the Reports Stats page.

The record

CVE
CVE-2026-78902
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

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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