Vulnerability-Lookup

CVE-2026-115683 (GCVE-0-2026-115683)

Vulnerability from cvelistv5 – Published: 2026-10-30 13:33 – Updated: 2026-11-02 11:33

Title

epiphany: TLS certificate warning bypass via race in tlsErrorPage message handler

Summary

A race condition in Epiphany allows a malicious website to bypass the TLS/SSL certificate warning page. Epiphany registers the main-world script message handler "tlsErrorPage" so its internal TLS error page can implement "Accept Risk and Proceed". The handler was registered immediately before loading the error page, leaving a brief window where the previously loaded untrusted origin could still call window.webkit.messageHandlers.tlsErrorPage.postMessage(...). The only authorization check compares a numeric WebKit page id that increments predictably; an attacker can burst-guess ids and approve a certificate exception with no user click. If a victim visits malicious site A that redirects to site B with an invalid certificate, site A can, for a few milliseconds, disable TLS certificate error warnings for host B until Epiphany is restarted, enabling man-in-the-middle or site spoofing for that host. Upstream report: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978 Proof of concept: https://beford.net/poc/ssl_poc.html Fix: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245 (register handlers on LOAD_COMMITTED). No fixed release tagged yet; reporter and maintainer describe all current versions as affected. Maintainer notes the risky registration timing dates to commit 1da1caed (Epiphany 45.x era); before that the handlers were always registered and similarly reachable from web content.

Severity

6.8 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 14:07 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

fedora CNA under the redhat root

CNA scorecard C 69/100 over 42 records in the last 180 days details

References

5 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-115683	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2560012	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/epiphany/-/work_it…
https://gitlab.gnome.org/GNOME/epiphany/-/merge_r…
https://beford.net/poc/ssl_poc.html

Impacted products

1 product

Vendor	Product	Version	CPE status
GNOME	Epiphany	Affected: 0 , < 51.1 (semver)	guessed

Date Public

2026-10-21 00:00

Credits

Red Hat would like to thank Fernando Munoz for reporting this issue.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-115683

Vulnerability from fkie_nvd - Published: 2026-10-30 14:16 - Updated: 2026-11-02 10:17

Severity

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

Summary

References

	URL	Tags
	patrick@puiterwijk.org	https://access.redhat.com/security/cve/CVE-2026-115683
	patrick@puiterwijk.org	https://beford.net/poc/ssl_poc.html
	patrick@puiterwijk.org	https://bugzilla.redhat.com/show_bug.cgi?id=2560012
	patrick@puiterwijk.org	https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245
	patrick@puiterwijk.org	https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.2,
        "source": "patrick@puiterwijk.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-115683",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-30T14:07:43.922960Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-30T14:16:39.373",
  "references": [
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://access.redhat.com/security/cve/CVE-2026-115683"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://beford.net/poc/ssl_poc.html"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2560012"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245"
    },
    {
      "source": "patrick@puiterwijk.org",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978"
    }
  ],
  "sourceIdentifier": "patrick@puiterwijk.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "patrick@puiterwijk.org",
      "type": "Secondary"
    }
  ]
}

GHSA-RGQ4-6FXX-V9RG

Vulnerability from github – Published: 2026-10-30 15:34 – Updated: 2026-10-30 15:34

Details

A race condition in Epiphany allows a malicious website to bypass the TLS/SSL certificate warning page.

Epiphany registers the main-world script message handler "tlsErrorPage" so its internal TLS error page can implement "Accept Risk and Proceed". The handler was registered immediately before loading the error page, leaving a brief window where the previously loaded untrusted origin could still call window.webkit.messageHandlers.tlsErrorPage.postMessage(...). The only authorization check compares a numeric WebKit page id that increments predictably; an attacker can burst-guess ids and approve a certificate exception with no user click.

If a victim visits malicious site A that redirects to site B with an invalid certificate, site A can, for a few milliseconds, disable TLS certificate error warnings for host B until Epiphany is restarted, enabling man-in-the-middle or site spoofing for that host.

Upstream report: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978 Proof of concept: https://beford.net/poc/ssl_poc.html Fix: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245 (register handlers on LOAD_COMMITTED). No fixed release tagged yet; reporter and maintainer describe all current versions as affected. Maintainer notes the risky registration timing dates to commit 1da1caed (Epiphany 45.x era); before that the handlers were always registered and similarly reachable from web content.

Severity

6.8 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-115683"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-30T14:16:39Z",
    "severity": "MODERATE"
  },
  "details": "A race condition in Epiphany allows a malicious website to bypass the TLS/SSL certificate warning page.\n\nEpiphany registers the main-world script message handler \"tlsErrorPage\" so its internal TLS error page can implement \"Accept Risk and Proceed\". The handler was registered immediately before loading the error page, leaving a brief window where the previously loaded untrusted origin could still call window.webkit.messageHandlers.tlsErrorPage.postMessage(...). The only authorization check compares a numeric WebKit page id that increments predictably; an attacker can burst-guess ids and approve a certificate exception with no user click.\n\nIf a victim visits malicious site A that redirects to site B with an invalid certificate, site A can, for a few milliseconds, disable TLS certificate error warnings for host B until Epiphany is restarted, enabling man-in-the-middle or site spoofing for that host.\n\nUpstream report: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978\nProof of concept: https://beford.net/poc/ssl_poc.html\nFix: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245 (register handlers on LOAD_COMMITTED). No fixed release tagged yet; reporter and maintainer describe all current versions as affected. Maintainer notes the risky registration timing dates to commit 1da1caed (Epiphany 45.x era); before that the handlers were always registered and similarly reachable from web content.",
  "id": "GHSA-rgq4-6fxx-v9rg",
  "modified": "2026-10-30T15:34:32Z",
  "published": "2026-10-30T15:34:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115683"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-115683"
    },
    {
      "type": "WEB",
      "url": "https://beford.net/poc/ssl_poc.html"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2560012"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

UBUNTU-CVE-2026-115683 (CVE-2026-115683)

Vulnerability from osv_ubuntu – Published: 2026-10-28 00:00 – Updated: 2026-10-28 00:00 – Source website

Details

[Unknown description]

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-115683	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-115683	REPORT
	https://gitlab.gnome.org/GNOME/epiphany/-/work_it…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "3.18.11-0ubuntu1"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "3.18.11-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@3.18.11-0ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.16.3-1ubuntu1",
        "3.18.0-1ubuntu2",
        "3.18.1-1ubuntu1",
        "3.18.3-0ubuntu1",
        "3.18.5-0ubuntu1",
        "3.18.5-0ubuntu1.1",
        "3.18.10-0ubuntu1",
        "3.18.11-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "3.28.6-0ubuntu1"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "3.28.6-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@3.28.6-0ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.26.1-1ubuntu1",
        "3.26.1-1ubuntu2",
        "3.26.1-1ubuntu4",
        "3.26.5.1-1ubuntu1",
        "3.27.90-1ubuntu1",
        "3.28.0.1-1ubuntu1",
        "3.28.1-1ubuntu1",
        "3.28.5-0ubuntu1",
        "3.28.6-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "3.36.4-0ubuntu2"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "3.36.4-0ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@3.36.4-0ubuntu2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.34.1-1",
        "3.34.1-1build1",
        "3.36.0-1",
        "3.36.1-1",
        "3.36.2-0ubuntu1",
        "3.36.3-0ubuntu1",
        "3.36.4-0ubuntu1",
        "3.36.4-0ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "42.4-0ubuntu1"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "42.4-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@42.4-0ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "41.0-1",
        "41.0-2",
        "41.2-1",
        "41.3-1",
        "42~beta-1",
        "42.0-1",
        "42.1-1",
        "42.1-1ubuntu1",
        "42.4-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "46.5-0ubuntu1"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "46.5-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@46.5-0ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "45.0-1",
        "45.1-1",
        "46~alpha-1",
        "46~beta-1",
        "46.0-1",
        "46.0-2build1",
        "46.5-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "50.4-2"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "50.4-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@50.4-2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "49.2-3ubuntu1",
        "50.4-1",
        "50.4-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "epiphany-browser",
            "binary_version": "49.2-3ubuntu1"
          },
          {
            "binary_name": "epiphany-browser-data",
            "binary_version": "49.2-3ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "epiphany-browser",
        "purl": "pkg:deb/ubuntu/epiphany-browser@49.2-3ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "48.5-3",
        "49.1-1",
        "49.2-1",
        "49.2-2",
        "49.2-3",
        "49.2-3ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "[Unknown description]",
  "id": "UBUNTU-CVE-2026-115683",
  "modified": "2026-10-28T00:00:00Z",
  "published": "2026-10-28T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-115683"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-115683"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-115683"
  ]
}

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.

Vulnerability timeline

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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.
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CVE-2026-115683 (GCVE-0-2026-115683)

FKIE_CVE-2026-115683

GHSA-RGQ4-6FXX-V9RG

UBUNTU-CVE-2026-115683 (CVE-2026-115683)

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