Vulnerability-Lookup

CVE-2026-49131 (GCVE-0-2026-49131)

Vulnerability from cvelistv5 – Published: 2026-08-03 20:29 – Updated: 2026-08-04 14:00 X_Open Source

Title

OPNsense < 26.1.9 Stored XSS via Firewall Rule Description Field

Summary

OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers with firewall rule management privileges to inject arbitrary HTML or JavaScript by embedding payloads in the firewall rule description field via the filter API endpoint. The unsanitized description value is persisted and later rendered through the default cell formatter in opnsense_bootgrid.js, which assigns raw cell content to innerHTML, causing injected scripts to execute in the browser of any authenticated user who views the Firewall Rules page, enabling session hijacking or credential theft.

Severity

5.1 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 14:00 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck

References

3 references

URL	Tags
https://docs.opnsense.org/releases/CE_26.1.html#j…	release-notes
https://github.com/opnsense/core/commit/b11d6b340…	patch
https://www.vulncheck.com/advisories/opnsense-sto…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Deciso B.V.	OPNsense	Affected: 0 , < 26.1.9 (semver)

Date Public

2026-06-02 00:00

Credits

Alex Williams from Pellera Technologies VulnCheck

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-49131

Vulnerability from fkie_nvd - Published: 2026-08-03 21:16 - Updated: 2026-08-04 15:16

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026
	disclosure@vulncheck.com	https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876f
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/opnsense-stored-xss-via-firewall-rule-description-field

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "defaultStatus": "affected",
          "packageURL": "pkg:github/opnsense/core",
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  "lastModified": "2026-08-04T15:16:36.377",
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}

GHSA-2WFC-8J3P-P6CP

Vulnerability from github – Published: 2026-08-03 21:31 – Updated: 2026-08-03 21:31

Details

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

5.1 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-49131"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T21:16:39Z",
    "severity": "MODERATE"
  },
  "details": "OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers with firewall rule management privileges to inject arbitrary HTML or JavaScript by embedding payloads in the firewall rule description field via the filter API endpoint. The unsanitized description value is persisted and later rendered through the default cell formatter in opnsense_bootgrid.js, which assigns raw cell content to innerHTML, causing injected scripts to execute in the browser of any authenticated user who views the Firewall Rules page, enabling session hijacking or credential theft.",
  "id": "GHSA-2wfc-8j3p-p6cp",
  "modified": "2026-08-03T21:31:38Z",
  "published": "2026-08-03T21:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49131"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opnsense/core/commit/b11d6b340716e240868ab19a369e058a46f0876f"
    },
    {
      "type": "WEB",
      "url": "https://docs.opnsense.org/releases/CE_26.1.html#june-02-2026"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opnsense-stored-xss-via-firewall-rule-description-field"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/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:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

WID-SEC-W-2026-2635

Vulnerability from csaf_certbund - Published: 2026-08-03 22:00 - Updated: 2026-08-03 22:00

Summary

OPNsense: Mehrere Schwachstellen ermöglichen Cross-Site Scripting

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: OPNsense ist eine freie Firewall-Distribution auf Basis von FreeBSD.

Angriff: Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in OPNsense ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

Betroffene Betriebssysteme: - Sonstiges

CVE-2026-49131

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source OPNsense <26.1.9 Open Source / OPNsense		<26.1.9

CVE-2026-49132

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Open Source OPNsense <26.1.9 Open Source / OPNsense		<26.1.9

References

4 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/advisories/GHSA-2wfc-8j3p-p6cp	external
https://github.com/advisories/GHSA-7979-V6F7-5R6J	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "OPNsense ist eine freie Firewall-Distribution auf Basis von FreeBSD.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in OPNsense ausnutzen, um einen Cross-Site Scripting Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-2635 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2635.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-2635 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2635"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-2wfc-8j3p-p6cp vom 2026-08-03",
        "url": "https://github.com/advisories/GHSA-2wfc-8j3p-p6cp"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-7979-V6F7-5R6J vom 2026-08-03",
        "url": "https://github.com/advisories/GHSA-7979-V6F7-5R6J"
      }
    ],
    "source_lang": "en-US",
    "title": "OPNsense: Mehrere Schwachstellen erm\u00f6glichen Cross-Site Scripting",
    "tracking": {
      "current_release_date": "2026-08-03T22:00:00.000+00:00",
      "generator": {
        "date": "2026-08-04T11:11:07.803+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-2635",
      "initial_release_date": "2026-08-03T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-08-03T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c26.1.9",
                "product": {
                  "name": "Open Source OPNsense \u003c26.1.9",
                  "product_id": "T057505"
                }
              },
              {
                "category": "product_version",
                "name": "26.1.9",
                "product": {
                  "name": "Open Source OPNsense 26.1.9",
                  "product_id": "T057505-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:opnsense:opnsense:26.1.9"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OPNsense"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-49131",
      "product_status": {
        "known_affected": [
          "T057505"
        ]
      },
      "release_date": "2026-08-03T22:00:00.000+00:00",
      "title": "CVE-2026-49131"
    },
    {
      "cve": "CVE-2026-49132",
      "product_status": {
        "known_affected": [
          "T057505"
        ]
      },
      "release_date": "2026-08-03T22:00:00.000+00:00",
      "title": "CVE-2026-49132"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-49131 (GCVE-0-2026-49131)

FKIE_CVE-2026-49131

GHSA-2WFC-8J3P-P6CP

WID-SEC-W-2026-2635

Tags

Sightings

Nomenclature