CVE-2026-26993

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 “raw” 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.

CVSS v3 4.6 MEDIUM

4.6^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.1 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163	Patch
https://github.com/FlintSH/Flare/releases/tag/v1.7.1	Product Release Notes
https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-02-20 03:16

Updated : 2026-03-03 17:35

NVD link : CVE-2026-26993

Mitre link : CVE-2026-26993

CVE.ORG link : CVE-2026-26993

JSON object : View

Products Affected

flintsh

flare

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-26993", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.6, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.1}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}]}, "published": "2026-02-20T03:16:01.153", "references": [{"url": "https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/FlintSH/Flare/releases/tag/v1.7.1", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "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."}], "lastModified": "2026-03-03T17:35:32.257", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "170C2076-8C10-4829-A9DC-35F79162D876", "versionEndExcluding": "1.7.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}