Vulnerability-Lookup

CVE-2026-0818 (GCVE-0-2026-0818)

Vulnerability from cvelistv5 – Published: 2026-01-28 07:39 – Updated: 2026-01-31 15:11

Title

CSS-based exfiltration of the content from partially encrypted emails when allowing remote content

Summary

When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations, then it was possible to extract the secret contents of the email. This vulnerability affects Thunderbird < 147.0.1 and Thunderbird < 140.7.1.

Severity ?

4.3 (Medium)


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

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-352 - Cross-Site Request Forgery (CSRF)
CWE-116 - Improper Encoding or Escaping of Output

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=1881530
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

Vendor

Product

Version

Mozilla

Thunderbird

Affected: unspecified , < 147.0.1 (custom)

Mozilla

Thunderbird

Affected: unspecified , < 140.7.1 (custom)

Credits

Leon Trampert, Daniel Weber, Christian Rossow, Michael Schwarz

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-0818

Vulnerability from fkie_nvd - Published: 2026-01-28 08:16 - Updated: 2026-01-31 16:16

Severity ?

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

Summary

References

URL	Tags
security@mozilla.org	https://bugzilla.mozilla.org/show_bug.cgi?id=1881530	Permissions Required
security@mozilla.org	https://www.mozilla.org/security/advisories/mfsa2026-07/	Vendor Advisory
security@mozilla.org	https://www.mozilla.org/security/advisories/mfsa2026-08/	Vendor Advisory

Impacted products

	Vendor	Product	Version
	mozilla	thunderbird	*
	mozilla	thunderbird	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*",
              "matchCriteriaId": "43089B19-3EF8-471F-9D20-3ACD1D15A8FE",
              "versionEndExcluding": "140.7.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*",
              "matchCriteriaId": "AC3CE289-5785-45C3-90D4-8B4F4416BD36",
              "versionEndExcluding": "147.0.1",
              "vulnerable": true
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          "negate": false,
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  ],
  "cveTags": [],
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      "lang": "en",
      "value": "When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations, then it was possible to extract the secret contents of the email. This vulnerability affects Thunderbird \u003c 147.0.1 and Thunderbird \u003c 140.7.1."
    }
  ],
  "id": "CVE-2026-0818",
  "lastModified": "2026-01-31T16:16:29.140",
  "metrics": {
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          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
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        "type": "Secondary"
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  "references": [
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      "tags": [
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}

GHSA-R27J-R277-J56H

Vulnerability from github – Published: 2026-01-28 09:30 – Updated: 2026-01-28 18:30

Details

CSS-based exfiltration of the content from partially encrypted emails when allowing remote content. This vulnerability affects Thunderbird < 147.0.1 and Thunderbird < 140.7.1.

Severity ?

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-0818"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-28T08:16:03Z",
    "severity": "MODERATE"
  },
  "details": "CSS-based exfiltration of the content from partially encrypted emails when allowing remote content. This vulnerability affects Thunderbird \u003c 147.0.1 and Thunderbird \u003c 140.7.1.",
  "id": "GHSA-r27j-r277-j56h",
  "modified": "2026-01-28T18:30:47Z",
  "published": "2026-01-28T09:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0818"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1881530"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-07"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-08"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

WID-SEC-W-2026-0230

Vulnerability from csaf_certbund - Published: 2026-01-27 23:00 - Updated: 2026-01-28 23:00

Summary

Mozilla Thunderbird: Schwachstelle ermöglicht Offenlegung von Informationen

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

Thunderbird ist ein Open Source E-Mail Client.

Angriff

Ein Angreifer kann eine Schwachstelle in Mozilla Thunderbird ausnutzen, um Informationen offenzulegen.

Betroffene Betriebssysteme

- Linux - UNIX - Windows

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": "Thunderbird ist ein Open Source E-Mail Client.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann eine Schwachstelle in Mozilla Thunderbird ausnutzen, um Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "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-2026-0230 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0230.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0230 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0230"
      },
      {
        "category": "external",
        "summary": "Mozilla Foundation Security Advisory vom 2026-01-27",
        "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-08/"
      },
      {
        "category": "external",
        "summary": "Mozilla Foundation Security Advisory vom 2026-01-27",
        "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2026-07/"
      }
    ],
    "source_lang": "en-US",
    "title": "Mozilla Thunderbird: Schwachstelle erm\u00f6glicht Offenlegung von Informationen",
    "tracking": {
      "current_release_date": "2026-01-28T23:00:00.000+00:00",
      "generator": {
        "date": "2026-01-29T07:51:14.260+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-0230",
      "initial_release_date": "2026-01-27T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-01-27T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-01-28T23:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-4880"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c147.0.1",
                "product": {
                  "name": "Mozilla Thunderbird \u003c147.0.1",
                  "product_id": "T050353"
                }
              },
              {
                "category": "product_version",
                "name": "147.0.1",
                "product": {
                  "name": "Mozilla Thunderbird 147.0.1",
                  "product_id": "T050353-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:mozilla:thunderbird:147.0.1"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c140.7.1",
                "product": {
                  "name": "Mozilla Thunderbird \u003c140.7.1",
                  "product_id": "T050354"
                }
              },
              {
                "category": "product_version",
                "name": "140.7.1",
                "product": {
                  "name": "Mozilla Thunderbird 140.7.1",
                  "product_id": "T050354-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:mozilla:thunderbird:140.7.1"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Thunderbird"
          }
        ],
        "category": "vendor",
        "name": "Mozilla"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-0818",
      "product_status": {
        "known_affected": [
          "T050354",
          "T050353"
        ]
      },
      "release_date": "2026-01-27T23:00:00.000+00:00",
      "title": "CVE-2026-0818"
    }
  ]
}

CERTFR-2026-AVI-0095

Vulnerability from certfr_avis - Published: 2026-01-28 - Updated: 2026-01-28

De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, un contournement de la politique de sécurité et un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Mozilla	Firefox	Firefox versions antérieures à 147.0.2
Mozilla	Thunderbird	Thunderbird versions antérieures à 140.7.1
Mozilla	Thunderbird	Thunderbird versions antérieures à 147.0.1

References

Title

Publication Time

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-0818 (GCVE-0-2026-0818)

FKIE_CVE-2026-0818

GHSA-R27J-R277-J56H

WID-SEC-W-2026-0230

CERTFR-2026-AVI-0095

Solutions

Tags

Sightings

Nomenclature