CVE-2026-26993 Flare has XSS vulnerability in Raw File Preview
Attackers can execute arbitrary scripts via malicious SVG files in raw preview mode, potentially stealing user data from the Flare file sharing platform.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-26993?
CVE-2026-26993 is a medium-severity cross-site scripting vulnerability in FlintSH Flare, published on 20 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-26993?
It affects 1 product.
Products include Flintsh Flare.
How do I fix CVE-2026-26993?
No fix has been published for CVE-2026-26993 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26993 being exploited?
There is no known exploitation of CVE-2026-26993 in the wild and no public exploit code.
Other vulnerabilities in FlintSH Flare
Sources
Also known as GHSA-q8fp-w6m5-4gjm.