CVE-2026-26993
Versions 1.7.0 and below allow users to upload files without proper content validation or sanitization.
Does this matter?
Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own.
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
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.28% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- flintsh/flare
- Source
- security-advisories@github.com
References
- https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163Patch
- https://github.com/FlintSH/Flare/releases/tag/v1.7.1Product, Release Notes
- https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjmExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.