What is the CVSS score of CVE-2026-26993?

CVE-2026-26993 has a CVSS 3.1 base score of 4.6 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Flare are affected by CVE-2026-26993?

Organizations using Flare should be aware of moderate risk from CVE-2026-26993, a cross-site scripting vulnerability rated CVSS 4.6.. A patch is available.

Is there a public PoC exploit available for CVE-2026-26993?

Yes, a public proof-of-concept exploit is available for CVE-2026-26993. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26993?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Flare CVE-2026-26993

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-20 security-advisories@github.com

XSS Flare Flintsh

4.6

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.6 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

PoC Detected

Mar 03, 2026 - 17:35 vuln.today

Public exploit code

Patch released

Mar 03, 2026 - 17:35 nvd

Patch available

CVE Published

Feb 20, 2026 - 03:16 nvd

MEDIUM 4.6

DescriptionGitHub Advisory

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.

AnalysisAI

Stored XSS in Flare file sharing platform versions 1.7.0 and below allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG or HTML files that execute when viewed in raw mode, potentially enabling session hijacking or data theft. The vulnerability stems from insufficient file content validation and sanitization during upload. Public exploit code exists; upgrade to version 1.7.1 or later to remediate.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Flare. 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) vulnerabilit

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 1.7.1.. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.