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CVE Record

CVE-2020-26693: A stored cross-site scripting (XSS) vulnerability was discovered in pfSense 2.4.5-p1 which allows an authen...

A stored cross-site scripting (XSS) vulnerability was discovered in pfSense 2.4.5-p1 which allows an authenticated attacker to execute arbitrary web scripts via exploitation of the load_balancer_monitor.php function.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-26693 is a stored XSS issue in pfSense 2.4.5-p1. An authenticated attacker could store script content through the load_balancer_monitor.php function, causing it to run in another administrator’s browser. This matters because pfSense commonly protects network edges, but the sources do not show active exploitation or a CVSS score.

Executive priority

Treat this as a targeted administrative-interface risk, not a confirmed emergency. Prioritize if pfSense 2.4.5-p1 is still in use, the admin UI is broadly reachable, or non-administrative users have UI access. No active exploitation is cited in the supplied sources.

Technical view

The CVE describes authenticated stored cross-site scripting in pfSense 2.4.5-p1 tied to load_balancer_monitor.php. The public record links to an upstream pfSense commit, but the supplied sources do not provide CVSS metrics, CWE classification, precise affected CPEs, exploit evidence, or named fixed release guidance.

Likely exposure

Exposure is most likely on pfSense 2.4.5-p1 systems where authenticated users can access the affected load balancer monitor functionality in the web UI. Internet exposure depends on whether the administrative interface is reachable, which is not established by the sources.

Exploitation context

The source bundle supports authenticated stored XSS only. It does not cite public exploitation, KEV listing, unauthenticated access, remote code execution, or privilege escalation. Business risk increases if lower-trust accounts can access the affected page or if admins browse the UI from privileged workstations.

Researcher notes

Evidence is sparse. The CVE record identifies stored XSS in pfSense 2.4.5-p1 and links one upstream commit. It does not include CVSS, CWE, affected CPEs, exploit telemetry, or a named fixed release. Validation should focus on version, UI reachability, and commit inclusion.

Mitigation direction

  • Check current Netgate or pfSense guidance for fixed versions and supported upgrade paths.
  • Review the referenced pfSense commit to identify the relevant corrected code path.
  • Upgrade affected pfSense 2.4.5-p1 systems through a vendor-supported release process.
  • Restrict pfSense administrative UI access to trusted networks and approved administrators.
  • Remove or limit low-trust accounts that can access load balancer monitor functions.

Validation and detection

  • Inventory pfSense deployments and confirm whether any run version 2.4.5-p1.
  • Determine whether load_balancer_monitor.php is present and reachable by authenticated users.
  • Review web UI access logs for unusual authenticated activity involving load balancer monitor pages.
  • Confirm upgraded systems include the vendor correction referenced by the CVE record.
  • Verify administrative UI exposure is limited to expected management networks.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2020-26693 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.