Vulnerability-Lookup

CVE-2026-71260 (GCVE-0-2026-71260)

Vulnerability from cvelistv5 – Published: 2026-08-05 12:26 – Updated: 2026-08-10 11:46

Title

ESPHome web_server Plaintext Password Disclosure via JSON "value" Field

Summary

ESPHome through 2026.7.0-dev discloses plaintext passwords via its web_server component. In WebServer::text_json_ (esphome/components/web_server/web_server.cpp), a text entity configured with mode: password (TEXT_MODE_PASSWORD) has its JSON "state" field correctly masked as "********", but the same serialization path unconditionally writes the raw password into the JSON "value" field via set_json_icon_state_value/set_json_value.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 15:30 UTC

CWE

CWE-522

Assigner

TuranSec redhat root

References

2 references

URL	Tags
https://github.com/esphome/esphome	third-party-advisory
https://github.com/esphome/esphome/blob/dev/espho…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
esphome	esphome	Affected: 0 , ≤ 2026.7.0 (semver)	guessed

Date Public

2026-08-05 12:26

Credits

Alibek Baxtiyorov

Show details on NVD website

JSON

To clipboard

{
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                "id": "CVE-2026-71260",
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                  },
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-08-05T15:30:39.169767Z",
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        }
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        "shortName": "TuranSec"
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          "url": "https://github.com/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cpp"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "ESPHome web_server Plaintext Password Disclosure via JSON \"value\" Field"
    }
  },
  "cveMetadata": {
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    "datePublished": "2026-08-05T12:26:08.759Z",
    "dateReserved": "2026-08-05T12:23:34.966Z",
    "dateUpdated": "2026-08-10T11:46:22.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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    "vulnrichment": {
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FKIE_CVE-2026-71260

Vulnerability from fkie_nvd - Published: 2026-08-05 13:24 - Updated: 2026-08-26 17:13

Severity

6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/esphome/esphome
	309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c	https://github.com/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cpp

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "esphome",
          "programFiles": [
            "esphome/components/web_server/web_server.cpp"
          ],
          "vendor": "esphome",
          "versions": [
            {
              "lessThanOrEqual": "2026.7.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ESPHome through 2026.7.0-dev discloses plaintext passwords via its web_server component. In WebServer::text_json_ (esphome/components/web_server/web_server.cpp), a text entity configured with mode: password (TEXT_MODE_PASSWORD) has its JSON \"state\" field correctly masked as \"********\", but the same serialization path unconditionally writes the raw password into the JSON \"value\" field via set_json_icon_state_value/set_json_value."
    }
  ],
  "id": "CVE-2026-71260",
  "lastModified": "2026-08-26T17:13:24.800",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-71260",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-05T15:30:39.169767Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-05T13:24:50.117",
  "references": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://github.com/esphome/esphome"
    },
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "url": "https://github.com/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cpp"
    }
  ],
  "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
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        {
          "lang": "en",
          "value": "CWE-522"
        }
      ],
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "type": "Secondary"
    }
  ]
}

GHSA-QMJJ-2RWX-5FFC

Vulnerability from github – Published: 2026-08-05 15:32 – Updated: 2026-08-05 15:32

Details

ESPHome through 2026.7.0-dev discloses plaintext passwords via its web_server component. In WebServer::text_json_() (esphome/components/web_server/web_server.cpp), a text entity configured with mode: password (TEXT_MODE_PASSWORD) has its JSON "state" field correctly masked as "**", but the same serialization path unconditionally writes the raw password into the JSON "value" field via set_json_icon_state_value()/set_json_value(). Because web_server listens on port 80 with no authentication by default, any attacker on the local network can retrieve the plaintext password (e.g. WiFi credentials, API tokens) via GET /text/ or the /events EventSource stream.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-71260"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-522"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T13:24:50Z",
    "severity": "MODERATE"
  },
  "details": "ESPHome through 2026.7.0-dev discloses plaintext passwords via its web_server component. In WebServer::text_json_() (esphome/components/web_server/web_server.cpp), a text entity configured with mode: password (TEXT_MODE_PASSWORD) has its JSON \"state\" field correctly masked as \"********\", but the same serialization path unconditionally writes the raw password into the JSON \"value\" field via set_json_icon_state_value()/set_json_value(). Because web_server listens on port 80 with no authentication by default, any attacker on the local network can retrieve the plaintext password (e.g. WiFi credentials, API tokens) via GET /text/\u003centity_id\u003e or the /events EventSource stream.",
  "id": "GHSA-qmjj-2rwx-5ffc",
  "modified": "2026-08-05T15:32:19Z",
  "published": "2026-08-05T15:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71260"
    },
    {
      "type": "WEB",
      "url": "https://github.com/esphome/esphome"
    },
    {
      "type": "WEB",
      "url": "https://github.com/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cpp"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-71260 (GCVE-0-2026-71260)

FKIE_CVE-2026-71260

GHSA-QMJJ-2RWX-5FFC

Tags

Sightings

Nomenclature

Related by attack behaviour