CVE-2026-26993 Details
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.
A stored Cross-Site Scripting (XSS) vulnerability has been identified in FlintSH Flare versions through 1.7.0. The issue arises from inadequate content validation and sanitization, allowing users to upload files containing malicious JavaScript, particularly within SVGs or other active content formats like HTML or XML. When these files are viewed in 'raw' mode', the embedded scripts execute in the context of the application's origin, potentially leading to the exfiltration of user data.
Users can update to FlintSH Flare version 1.7.1 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 23, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/FlintSH/Flare/commit/7763d7b954799552f287ab9260bb1353f8880163 | [email protected] | Patch |
| https://github.com/FlintSH/Flare/releases/tag/v1.7.1 | [email protected] | ProductRelease Notes |
| https://github.com/FlintSH/Flare/security/advisories/GHSA-q8fp-w6m5-4gjm | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| flintsh flare | < 1.7.1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 3, 2026 | Initial Analysis | [email protected] |
| Feb 20, 2026 | New CVE Received | [email protected] |