CVE-2026-49820

{"id": "CVE-2026-49820", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49820", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-14T15:40:09.566556Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "getprobo", "product": "probo", "versions": [{"status": "affected", "version": "< 0.193.1"}]}]}], "published": "2026-08-13T15:19:41.410", "references": [{"url": "https://github.com/getprobo/probo/blob/main/SECURITY_NOTES.md", "source": "security-advisories@github.com"}, {"url": "https://github.com/getprobo/probo/security/advisories/GHSA-x7qq-m748-8p2c", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-601"}]}], "descriptions": [{"lang": "en", "value": "Probo is a self-hostable governance, risk, and compliance (GRC) platform built for engineering and security teams. Probo's `saferedirect` package validates redirect URLs used across authentication flows (OIDC, SAML, session transfer, OAuth connectors, and trust-center magic links). Prior to version 0.19.3.1, the validator only inspected the second character of relative paths, so a URL like `/../\\evil.com` passed validation because the second character is `.`. Go's `http.Redirect` normalizes this path to `/\\evil.com` before setting the `Location` header. Browsers can interpret the backslash as a host separator and redirect the user to an external domain (`https://evil.com`), bypassing the intended same-origin restriction. This enables open-redirect phishing: an attacker can craft a `continue` parameter (or embed a malicious URL in a session-transfer token) that appears to originate from a trusted Probo domain but redirects victims elsewhere. This is fixed in `go.probo.inc/probo` 0.193.1 by normalizing relative paths with `path.Clean` before validation, rejecting backslashes (including percent-encoded `%5c`) anywhere in the path, and re-checking the normalized result for protocol-relative and backslash prefixes. Self-hosted deployments should upgrade to probod v0.194.1 or later. SaaS deployments on getprobo.com are patched. No practical workaround is available for self-hosted installations."}, {"lang": "es", "value": "Probo es una plataforma de gobernanza, riesgo y cumplimiento (GRC) autoalojable, dise\u00f1ada para equipos de ingenier\u00eda y seguridad. El paquete \u201csaferedirect\u201d de Probo valida las URLs de redirecci\u00f3n utilizadas en los flujos de autenticaci\u00f3n (OIDC, SAML, transferencia de sesi\u00f3n, conectores OAuth y enlaces m\u00e1gicos de centros de confianza). Antes de la versi\u00f3n 0.19.3.1, el validador solo inspeccionaba el segundo car\u00e1cter de las rutas relativas, por lo que una URL como \u201c/.. / \\evil.com\u201d pasaba la validaci\u00f3n porque el segundo car\u00e1cter es \u201c.\u201d. \u201chttp.Redirect\u201d de Go normaliza esta ruta a \u201c/\\evil.com\u201d antes de establecer el encabezado \u201cLocation\u201d. Los navegadores pueden interpretar la barra invertida como un separador de host y redirigir al usuario a un dominio externo (\u201chttps://evil.com\u201d), eludiendo la restricci\u00f3n de mismo origen prevista. Esto permite el phishing de redirecci\u00f3n abierta: un atacante puede crear un par\u00e1metro \u201ccontinue\u201d (o incrustar una URL maliciosa en un token de transferencia de sesi\u00f3n) que parece originarse de un dominio de Probo de confianza pero redirige a las v\u00edctimas a otro lugar. Esto se corrige en \u201cgo.probo.inc/probo\u201d 0.193.1 normalizando las rutas relativas con \u201cpath.Clean\u201d antes de la validaci\u00f3n, rechazando las barras invertidas (incluyendo \u201c%5c\u201d codificado en porcentaje) en cualquier parte de la ruta, y volviendo a verificar el resultado normalizado en busca de prefijos relativos al protocolo y de barra invertida. Las implementaciones autoalojadas deben actualizar a probod v0.194.1 o posterior. Las implementaciones SaaS en getprobo.com est\u00e1n parcheadas. No hay una soluci\u00f3n alternativa pr\u00e1ctica disponible para las instalaciones autoalojadas."}], "lastModified": "2026-10-24T16:10:00.153", "sourceIdentifier": "security-advisories@github.com"}