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CVE-2026-3987 (GCVE-0-2026-3987)

Vulnerability from cvelistv5 – Published: 2026-04-01 21:32 – Updated: 2026-08-10 16:46
VLAI
Title
WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI
Summary
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 00:00 UTC
CWE
References
Impacted products
Vendor Product Version CPE status
WatchGuard Fireware OS Affected: 2025.1 , < 2026.2 (custom)
Affected: 12.6.1 , < 12.12 (custom)
    cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
    cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-01 21:32
Credits
Show details on NVD website

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        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Fireware OS",
              "vendor": "WatchGuard",
              "versions": [
                {
                  "lessThan": "2026.2",
                  "status": "affected",
                  "version": "2025.1",
                  "versionType": "custom"
                },
                {
                  "lessThan": "12.12",
                  "status": "affected",
                  "version": "12.6.1",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "2026.2",
                      "versionStartIncluding": "2025.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "12.12",
                      "versionStartIncluding": "12.6.1",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ],
              "operator": "OR"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "btaol"
            }
          ],
          "datePublic": "2026-04-01T21:32:30.426Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "WatchGuard is not aware of any exploitation of this issue in the wild."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "baseScore": 8.6,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-10T16:46:12.527Z",
            "orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
            "shortName": "WatchGuard"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://psirt.watchguard.com/CVE-2026-3987"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Fireware OS 2026.2, Fireware OS 12.12"
            }
          ],
          "title": "WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
        "assignerShortName": "WatchGuard",
        "cveId": "CVE-2026-3987",
        "datePublished": "2026-04-01T21:32:30.426Z",
        "dateReserved": "2026-03-11T15:01:46.222Z",
        "dateUpdated": "2026-08-10T16:46:12.527Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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