CVE-2026-26993

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{"affected": [{"affectedData": [{"product": "Flare", "vendor": "FlintSH", "versions": [{"status": "affected", "version": "1.7.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:*", "matchCriteriaId": "170C2076-8C10-4829-A9DC-35F79162D876", "versionEndExcluding": "1.7.1", "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. Versions 1.7.0 and below allow users to upload files without proper content validation or sanitization. By embedding malicious JavaScript within an SVG (or other active content formats such as HTML or XML), an attacker can achieve script execution in the context of the application's origin when a victim views the file in \u201craw\u201d mode. This results in a stored Cross-Site Scripting (XSS) vulnerability that can be exploited to exfiltrate user data. This issue has been fixed in version 1.7.1."}, {"lang": "es", "value": "Flare es una plataforma autoalojable para compartir archivos basada en Next.js que se integra con herramientas de captura de pantalla. Las versiones 1.7.0 e inferiores permiten a los usuarios subir archivos sin una validaci\u00f3n o saneamiento de contenido adecuados. Al incrustar JavaScript malicioso dentro de un SVG (u otros formatos de contenido activo como HTML o XML), un atacante puede lograr la ejecuci\u00f3n de scripts en el contexto del origen de la aplicaci\u00f3n cuando una v\u00edctima ve el archivo en modo 'raw'. Esto resulta en una vulnerabilidad de cross-site scripting (XSS) almacenado que puede ser explotada para exfiltrar datos de usuario. Este problema ha sido solucionado en la versi\u00f3n 1.7.1."}], "id": "CVE-2026-26993", "lastModified": "2026-06-17T10:26:30.283", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26993", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-23T18:09:00.256768Z", "version": "2.0.3"}}]}, "published": "2026-02-20T03:16:01.153", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/FlintSH/Flare/releases/tag/v1.7.1"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.7.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Flare", "source": "cna", "vendor": "FlintSH"}, "product": "flare", "vendor": "flintsh"}], "analysis": {"en": {"generated_at": "2026-04-17T17:32:12.703768+00:00", "value": {"mitigation_remediation": ["Upgrade Flare to release 1.7.1 or later to get the author\u2019s patch.", "If an update is not immediately feasible, disable raw file preview for untrusted users or delete files that were uploaded before the fix.", "Implement server\u2011side validation and HTML sanitization on all uploaded content to remove executable scripts before storage."], "summary": {"action": "Apply Patch", "impact": "Stored Cross\u2011Site Scripting (XSS) that executes script in the application\u2019s origin."}, "threat_synthesis": {"affected_systems": "FlintSH\u2019s Flare platform, versions 1.7.0 and earlier, are affected. The vulnerability is present in the general file preview functionality and is not limited to any particular deployment configuration. Version 1.7.1 remedies the issue.", "description_and_impact": "Flare, a self\u2011hosted file sharing application, allowed the upload of files without validating or sanitizing content. By embedding malicious JavaScript inside an SVG or other active content advertised as a raw file, an attacker can cause the script to run with the application\u2019s origin when any user opens the file in raw mode. This stored XSS flaw enables the exfiltration of sensitive information or impersonation of the victim in the context of the site. The failure is a classic input validation weakness, classified as CWE\u201179.", "risk_and_exploitability": "The CVSS score is 4.6, indicating moderate severity, and the EPSS score is below 1\u202f%, showing a low probability of exploitation at this time. The vulnerability is not yet listed in CISA\u2019s KEV catalog. The attack vector is inferred as a pre\u2011existing upload path; an attacker must first upload a crafted file to a Flare instance, then persuade a victim user to view the file in raw mode. Because the flaw involves stored input, anyone with write access can embed malicious payloads, and any authenticated or anonymous user who opens the file will be affected."}}}}, "created": "2026-02-20T09:52:46.747137+00:00", "updated": "2026-04-17T17:45:24.336227+00:00", "vendors": ["flintsh", "flintsh$PRODUCT$flare"]}