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CVE-2026-109434 (GCVE-0-2026-109434)

Vulnerability from nvd – Published: 2026-10-19 18:12 – Updated: 2026-10-19 18:36

Title

Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing

Summary

Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability that allows remote attackers to impersonate the browser's trusted address bar by entering fullscreen mode via the Fullscreen API without displaying a persistent notification or trusted-origin indicator. Attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content after a single user tap, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.

Severity

5.1 (Medium)


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

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-19 18:36 UTC

CWE

CWE-451 - User Interface (UI) Misrepresentation of Critical Information

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6503 records in the last 180 days details

References

2 references

URL	Tags
https://www.fenrir-inc.com/jp/news/2026/10/15/sle…	vendor-advisorypatch
https://www.vulncheck.com/advisories/sleipnir-bro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Fenrir	Sleipnir Mobile for Android	Affected: 0 , < 3.9.0 (semver)

Date Public

2026-10-15 00:00

Credits

Fanda Dwi Aprilianto

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
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              "content": {
                "id": "CVE-2026-109434",
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                    "Technical Impact": "partial"
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                "timestamp": "2026-10-19T18:36:32.278770Z",
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        "providerMetadata": {
          "dateUpdated": "2026-10-19T18:36:45.158Z",
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          ],
          "url": "https://www.fenrir-inc.com/jp/news/2026/10/15/sleipnir-mobile-for-android-3-9-0/"
        },
        {
          "name": "VulnCheck Advisory: Sleipnir Browser \u003c 3.9.0 Fullscreen Address Bar Spoofing",
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      "source": {
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CVE-2026-109434 (GCVE-0-2026-109434)

Vulnerability from cvelistv5 – Published: 2026-10-19 18:12 – Updated: 2026-10-19 18:36

Title

Sleipnir Browser < 3.9.0 Fullscreen Address Bar Spoofing

Summary

Fenrir Sleipnir Browser for Android before 3.9.0 contains a UI spoofing vulnerability that allows remote attackers to impersonate the browser's trusted address bar by entering fullscreen mode via the Fullscreen API without displaying a persistent notification or trusted-origin indicator. Attackers can render a counterfeit address bar showing a trusted origin over attacker-controlled content after a single user tap, enabling credential harvesting, malware delivery, or social engineering through fake login, update, or payment pages.

Severity

5.1 (Medium)


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

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-19 18:36 UTC

CWE

CWE-451 - User Interface (UI) Misrepresentation of Critical Information

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6503 records in the last 180 days details

References

2 references

URL	Tags
https://www.fenrir-inc.com/jp/news/2026/10/15/sle…	vendor-advisorypatch
https://www.vulncheck.com/advisories/sleipnir-bro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Fenrir	Sleipnir Mobile for Android	Affected: 0 , < 3.9.0 (semver)

Date Public

2026-10-15 00:00

Credits

Fanda Dwi Aprilianto

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
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            "other": {
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                "id": "CVE-2026-109434",
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                    "Exploitation": "none"
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                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-10-19T18:36:32.278770Z",
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Find a vulnerability

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2 vulnerabilities found for Sleipnir Mobile for Android by Fenrir

CVE-2026-109434 (GCVE-0-2026-109434)

CVE-2026-109434 (GCVE-0-2026-109434)