CVE-2026-30942

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{"affected": [{"affectedData": [{"product": "Flare", "vendor": "FlintSH", "versions": [{"status": "affected", "version": "< 1.7.3"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:*", "matchCriteriaId": "8BA859D8-65BC-4C73-9259-FE81349F05AE", "versionEndExcluding": "1.7.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Flare is a Next.js-based, self-hostable file sharing platform that integrates with screenshot tools. Prior to 1.7.3, an authenticated path traversal vulnerability in /api/avatars/[filename] allows any logged-in user to read arbitrary files from within the application container. The filename URL parameter is passed to path.join() without sanitization, and getFileStream() performs no path validation, enabling %2F-encoded ../ sequences to escape the uploads/avatars/ directory and read any file accessible to the nextjs process under /app/. Authentication is enforced by Next.js middleware. However, on instances with open registration enabled (the default), any attacker can self-register and immediately exploit this. This vulnerability is fixed in 1.7.3."}, {"lang": "es", "value": "Flare es una plataforma de intercambio de archivos autoalojable basada en Next.js que se integra con herramientas de captura de pantalla. Antes de la versi\u00f3n 1.7.3, una vulnerabilidad de salto de ruta autenticado en /api/avatars/[filename] permite a cualquier usuario con sesi\u00f3n iniciada leer archivos arbitrarios desde dentro del contenedor de la aplicaci\u00f3n. El par\u00e1metro URL filename se pasa a path.join() sin sanitizaci\u00f3n, y getFileStream() no realiza validaci\u00f3n de ruta, lo que permite que las secuencias ../ codificadas con %2F escapen del directorio uploads/avatars/ y lean cualquier archivo accesible para el proceso nextjs bajo /app/. La autenticaci\u00f3n es aplicada por el middleware de Next.js. Sin embargo, en instancias con registro abierto habilitado (el valor predeterminado), cualquier atacante puede autorregistrarse y explotar esto inmediatamente. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.7.3."}], "id": "CVE-2026-30942", "lastModified": "2026-06-17T10:33:11.680", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-30942", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-10T17:39:47.598213Z", "version": "2.0.3"}}]}, "published": "2026-03-10T18:18:54.093", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FlintSH/Flare/commit/cd894cc480619aef958be5de72b1445222fd8d36"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/FlintSH/Flare/releases/tag/v1.7.3"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/FlintSH/Flare/security/advisories/GHSA-h639-p7m9-mpgp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "flare: Flare: Information disclosure via authenticated path traversal", "id": "2446087", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446087"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-22", "details": ["A flaw was found in Flare, a file sharing platform. An authenticated path traversal vulnerability exists in the /api/avatars/[filename] endpoint, allowing a logged-in user to read arbitrary files from the application container. This occurs because the filename parameter is not properly sanitized, enabling specially crafted sequences to bypass directory restrictions. If open registration is enabled, an attacker can self-register and exploit this vulnerability, leading to sensitive information disclosure."], "mitigation": {"lang": "en:us", "value": "Disable open registration to prevent unauthenticated attackers from creating accounts to exploit this vulnerability. This limits exploitation to existing authenticated users until the upgrade to 1.7.3 can be applied."}, "name": "CVE-2026-30942", "public_date": "2026-03-10T16:44:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-30942\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-30942\nhttps://github.com/FlintSH/Flare/commit/cd894cc480619aef958be5de72b1445222fd8d36\nhttps://github.com/FlintSH/Flare/releases/tag/v1.7.3\nhttps://github.com/FlintSH/Flare/security/advisories/GHSA-h639-p7m9-mpgp"], "statement": "This IMPORTANT path traversal vulnerability in Flare allows authenticated users to read arbitrary files from the /app/ directory via the avatars endpoint. Exploitation requires authentication (PR:L), but instances with default open registration allow attackers to self-register and immediately exploit. Impact is high confidentiality loss; no integrity or availability impact. Fixed in version 1.7.3.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.7.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Flare", "source": "cna", "vendor": "FlintSH"}, "product": "flare", "vendor": "flintsh"}], "analysis": {"en": {"generated_at": "2026-04-17T11:43:07.281842+00:00", "value": {"mitigation_remediation": ["Upgrade Flare to version 1.7.3 or later, which removes the unsanitized path handling.", "If an immediate upgrade is not possible, disable open registration or enforce strong authentication to prevent unauthenticated users from creating an account.", "Restrict file access on the reverse proxy or within the application by limiting the /api/avatars endpoint to only serve files from the intended directory and rejecting any requests containing path traversal patterns."], "summary": {"action": "Immediate Patch", "impact": "Arbitrary file read and potential information disclosure within the application container"}, "threat_synthesis": {"affected_systems": "FlintSH\u2019s Flare platform, specifically any release version before 1.7.3, is affected. Users running v1.7.2 or earlier, including the default distribution that enables open registration, are vulnerable. The issue is mitigated in the 1.7.3 release and later.", "description_and_impact": "Flare, a self\u2011hostable file sharing platform based on Next.js, contains a path traversal flaw in the /api/avatars/[filename] endpoint. The filename parameter is fed directly into path.join() without sanitization, and the subsequent getFileStream() call performs no path validation. This allows a logged\u2011in user to request specially crafted URLs containing percent\u2011encoded '../' sequences that escape the intended uploads/avatars/ directory and read any file readable by the Next.js process under the /app/ directory. The flaw, identified as CWE\u201122, results in arbitrary file read and potential information disclosure within the container.", "risk_and_exploitability": "A high CVSS score of 8.3 indicates significant impact. Although the EPSS score is below 1% and the vulnerability is not listed in the CISA known exploited vulnerability catalog, based on the description it is inferred that the attack vector is straightforward: an attacker can either self\u2011register (when open registration is enabled) or use existing credentials to authenticate, then issue a request to the vulnerable endpoint with a crafted filename. This traversal yields arbitrary file reads and could expose sensitive configuration or code files, potentially leading to further compromise. Therefore, the risk is high, especially on publicly exposed instances."}}}}, "created": "2026-03-11T11:49:34.549585+00:00", "updated": "2026-04-17T11:45:06.247083+00:00", "vendors": ["flintsh", "flintsh$PRODUCT$flare"]}