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Vulnerability record · CVE-2026-26993 · published 20 February 2026

CVE-2026-26993: Flintsh flare cross-site scripting vulnerability

FFlintsh · Flare

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.

5.4 CVSS 3.1 Medium EPSS 0.37% · top 71.9% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163 Patch
https://github.com/FlintSH/Flare/releases/tag/v1.7.1 ProductRelease Notes
https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-26993), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.