CVE-2026-27899

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{"affected": [{"affectedData": [{"product": "wg-portal", "vendor": "h44z", "versions": [{"status": "affected", "version": "< 2.1.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:wgportal:wireguard_portal:*:*:*:*:*:*:*:*", "matchCriteriaId": "EBB8589E-9B73-45D5-A26F-84E7A69EE57B", "versionEndExcluding": "2.1.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "WireGuard Portal (or wg-portal) is a web-based configuration portal for WireGuard server management. Prior to version 2.1.3, any authenticated non-admin user can become a full administrator by sending a single PUT request to their own user profile endpoint with `\"IsAdmin\": true` in the JSON body. After logging out and back in, the session picks up admin privileges from the database. When a user updates their own profile, the server parses the full JSON body into the user model, including the `IsAdmin` boolean field. A function responsible for preserving calculated or protected attributes pins certain fields to their database values (such as base model data, linked peer count, and authentication data), but it does not do this for `IsAdmin`. As a result, whatever value the client sends for `IsAdmin` is written directly to the database. After the exploit, the attacker has full admin access to the WireGuard VPN management portal. The problem was fixed in v2.1.3. The docker images for the tag 'latest' built from the master branch also include the fix."}, {"lang": "es", "value": "WireGuard Portal (o wg-portal) es un portal de configuraci\u00f3n basado en web para la gesti\u00f3n de servidores WireGuard. Antes de la versi\u00f3n 2.1.3, cualquier usuario autenticado no administrador puede convertirse en un administrador completo enviando una \u00fanica solicitud PUT a su propio endpoint de perfil de usuario con 'IsAdmin': true en el cuerpo JSON. Despu\u00e9s de cerrar y volver a iniciar sesi\u00f3n, la sesi\u00f3n adquiere privilegios de administrador de la base de datos. Cuando un usuario actualiza su propio perfil, el servidor analiza el cuerpo JSON completo en el modelo de usuario, incluyendo el campo booleano IsAdmin. Una funci\u00f3n responsable de preservar atributos calculados o protegidos fija ciertos campos a sus valores de base de datos (como datos del modelo base, recuento de pares vinculados y datos de autenticaci\u00f3n), pero no lo hace para IsAdmin. Como resultado, cualquier valor que el cliente env\u00ede para IsAdmin se escribe directamente en la base de datos. Despu\u00e9s del exploit, el atacante tiene acceso de administrador completo al portal de gesti\u00f3n de VPN de WireGuard. El problema se solucion\u00f3 en la v2.1.3. Las im\u00e1genes de docker para la etiqueta 'latest' construidas desde la rama master tambi\u00e9n incluyen la soluci\u00f3n."}], "id": "CVE-2026-27899", "lastModified": "2026-06-17T10:27:50.727", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27899", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-26T16:02:22.653465Z", "version": "2.0.3"}}]}, "published": "2026-02-26T02:16:20.557", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/h44z/wg-portal/security/advisories/GHSA-5rmx-256w-8mj9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-269"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-863"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.1.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "wg-portal", "source": "cna", "vendor": "h44z"}, "product": "wg-portal", "vendor": "h44z"}], "analysis": {"en": {"generated_at": "2026-04-18T10:27:48.086764+00:00", "value": {"mitigation_remediation": ["Upgrade to wg-portal version 2.1.3 or later or use the patched docker image. This fixes the code that improperly writes the IsAdmin field.", "Modify the user update logic to reject or reset the IsAdmin field unless the requester already has administrator privileges. This will prevent privilege escalation through valid update requests.", "If upgrading immediately is not possible, temporarily disable non\u2011admin users\u2019 ability to modify their own profile or restrict their access to the user update endpoint until the fix is applied."], "summary": {"action": "Patch Now", "impact": "Privilege Escalation to Administrator"}, "threat_synthesis": {"affected_systems": "The affected product is WireGuard Portal (wg-portal) from the vendor h44z. Versions older than 2.1.3 are vulnerable, including the docker images tagged 'latest' built from the master branch prior to the fix.", "description_and_impact": "The vulnerability allows an authenticated user who is not an administrator to gain full administrator rights. By sending a single authenticated PUT request to the user profile endpoint with \"IsAdmin\": true, the server fails to protect this field when persisting the profile. Consequently, the value is written directly to the database, elevating the user to an administrator. This results in unrestricted control over the WireGuard VPN management portal.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high severity of this issue. An exploit requires legitimate authentication to the portal, which the user already possesses, making the attack path straightforward once the user has credentials. While the EPSS score is below 1%, suggesting a low probability of widespread exploitation at the time of analysis, the potential impact of full administrative takeover warrants urgent attention. The vulnerability is not listed in the CISA KEV catalog. Attackers can simply send the crafted request to their own user profile endpoint to achieve escalation."}}}}, "created": "2026-02-26T13:10:15.114218+00:00", "updated": "2026-04-18T10:30:35.766140+00:00", "vendors": ["h44z", "h44z$PRODUCT$wg-portal"]}