CVE-2026-26993

Flare has XSS vulnerability in Raw File Preview

CVSS 4.6 MEDIUMEPSS 0.3%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

20 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:U/C:L/I:L/A:N

Affected products

FlintSH · Flare

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References

https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163 https://github.com/FlintSH/Flare/releases/tag/v1.7.1 https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm