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TI-2026-21472 Aliases CVE-2026-26993

Flare has XSS vulnerability in Raw File Preview

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00324 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FlintSHFlare1.7.1—No fix listedCNA
  • Flare VendorFlintSH Affected 1.7.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:*before 1.7.1VulnerableFlintSH
  • cpe:2.3:a:flintsh:flare:*:*:*:*:*:*:*:* Versions before 1.7.1 Vulnerable ·FlintSH

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26993

References

Exploit 1

Patch 1

Other 1

  • TI-2026-23767 Flare has a Path Traversal in /api/avatars/[filename] CVSS 4.0HIGH 8.3
  • TI-2026-23463 Flare: Password‑Protected Thumbnail Bypass CVSS 4.0HIGH 8.2
  • TI-2026-23464 Flare: Private File IDOR via raw/direct endpoints CVSS 4.0MEDIUM 6.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences