{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34773", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-30T19:54:55.555Z", "datePublished": "2026-04-03T23:50:42.168Z", "dateUpdated": "2026-04-06T16:03:54.878Z"}, "containers": {"cna": {"title": "Electron: Registry key path injection in app.setAsDefaultProtocolClient on Windows", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-74", "lang": "en", "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/electron/electron/security/advisories/GHSA-mwmh-mq4g-g6gr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/electron/electron/security/advisories/GHSA-mwmh-mq4g-g6gr"}], "affected": [{"vendor": "electron", "product": "electron", "versions": [{"version": "< 38.8.6", "status": "affected"}, {"version": ">= 39.0.0-alpha.1, < 39.8.1", "status": "affected"}, {"version": ">= 40.0.0-alpha.1, < 40.8.1", "status": "affected"}, {"version": ">= 41.0.0-alpha.1, < 41.0.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-03T23:50:42.168Z"}, "descriptions": [{"lang": "en", "value": "Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\\Software\\Classes\\, potentially hijacking existing protocol handlers. Apps are only affected if they call app.setAsDefaultProtocolClient() with a protocol name derived from external or untrusted input. Apps that use a hardcoded protocol name are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0."}], "source": {"advisory": "GHSA-mwmh-mq4g-g6gr", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-06T16:03:47.836700Z", "id": "CVE-2026-34773", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-06T16:03:54.878Z"}}]}}

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{"bugzilla": {"description": "electron: Electron: Protocol handler hijacking via improper validation of protocol names", "id": "2455025", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455025"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-791", "details": ["Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on Windows, app.setAsDefaultProtocolClient(protocol) did not validate the protocol name before writing to the registry. Apps that pass untrusted input as the protocol name may allow an attacker to write to arbitrary subkeys under HKCU\\Software\\Classes\\, potentially hijacking existing protocol handlers. Apps are only affected if they call app.setAsDefaultProtocolClient() with a protocol name derived from external or untrusted input. Apps that use a hardcoded protocol name are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.", "A flaw was found in Electron, a framework for building desktop applications. On Windows, the `app.setAsDefaultProtocolClient()` function did not properly validate protocol names before writing to the system registry. This vulnerability could allow a local attacker, through an application that processes untrusted input, to write to arbitrary registry subkeys. Consequently, an attacker might be able to hijack existing protocol handlers, leading to unintended program execution or other system modifications."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34773", "package_state": [{"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Not affected", "package_name": "podman-desktop-macos-1-0", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:podman_desktop:1", "fix_state": "Not affected", "package_name": "podman-desktop-windows-1-0", "product_name": "Red Hat Build of Podman Desktop"}, {"cpe": "cpe:/a:redhat:podman_desktop:0", "fix_state": "Not affected", "package_name": "rhdesktop/rh-podman-desktop-ext-openshift-local-rhel10", "product_name": "Red Hat Build of Podman Desktop - Tech Preview"}], "public_date": "2026-04-03T23:50:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34773\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34773\nhttps://github.com/electron/electron/security/advisories/GHSA-mwmh-mq4g-g6gr"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,38.8.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[39.0.0-alpha.1,39.8.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[40.0.0-alpha.1,40.8.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[41.0.0-alpha.1,41.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "electron", "source": "cna", "vendor": "electron"}, "product": "electron", "vendor": "electron"}], "analysis": {"en": {"generated_at": "2026-04-07T02:30:13.494360+00:00", "value": {"mitigation_remediation": ["Upgrade Electron to version 38.8.6 or later (including 39.8.1, 40.8.1, 41.0.0 and newer)", "Ensure that calls to app.setAsDefaultProtocolClient use hard\u2011coded protocol names or validate and sanitize any externally sourced input before passing it", "Review and audit Electron\u2011based applications to confirm they do not use untrusted data for protocol registration", "Monitor Windows registry for unexpected changes to HKCU\\Software\\Classes that may indicate protocol hijacking activity"], "summary": {"action": "Patch urgently", "impact": "Registry injection enabling protocol hijacking"}, "threat_synthesis": {"affected_systems": "All Electron-based desktop applications running on Windows that invoke app.setAsDefaultProtocolClient with a protocol name derived from external or otherwise untrusted input are affected. The issue is present only in Electron versions prior to 38.8.6, 39.8.1, 40.8.1, and 41.0.0; applications that use hard\u2011coded protocol names are not vulnerable. The vulnerability is specific to the Windows platform where protocol registration occurs via the registry.", "description_and_impact": "Electron applications use app.setAsDefaultProtocolClient to register custom protocols. In versions before 38.8.6, 39.8.1, 40.8.1, and 41.0.0 on Windows, the function fails to validate the protocol argument, allowing a user\u2011supplied string that can be interpreted as a registry path. This flaw combines input validation errors (CWE\u201120), path traversal (CWE\u201174), and an unchecked heap allocation (CWE\u2011791). An attacker who can influence the protocol name sent to the call can write to arbitrary subkeys under HKCU\\Software\\Classes, potentially hijacking existing protocol handlers and redirecting traffic to malicious executables.", "risk_and_exploitability": "The CVSS score of 4.7 reflects moderate severity, and an EPSS probability of less than 1% indicates low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, further suggesting that active exploitation is currently uncommon. Exploitation requires an attacker to supply untrusted data to an Electron app\u2019s setAsDefaultProtocolClient call, so the attack vector is local or user\u2011initiated. Although the flaw does not provide arbitrary code execution, it enables protocol hijacking that could lead to phishing or malware delivery when combined with social engineering or other attacks."}}}}, "created": "2026-04-06T21:21:36.976573+00:00", "updated": "2026-04-07T07:16:25.587550+00:00", "vendors": ["electron", "electron$PRODUCT$electron"]}