What is the CVSS score of CVE-2026-26281?

CVE-2026-26281 has a CVSS 3.1 base score of 4.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Invoiceplane are affected by CVE-2026-26281?

Organizations using InvoicePlane should be aware of moderate risk from CVE-2026-26281, a cross-site scripting vulnerability rated CVSS 4.4.. A patch is available.

Is there a public PoC exploit available for CVE-2026-26281?

Yes, a public proof-of-concept exploit is available for CVE-2026-26281. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26281?

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

Invoiceplane CVE-2026-26281

MEDIUM

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

2026-02-18 security-advisories@github.com

XSS Invoiceplane

4.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.4 MEDIUM

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

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

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 20, 2026 - 17:14 vuln.today

Public exploit code

Patch released

Feb 20, 2026 - 17:14 nvd

Patch available

CVE Published

Feb 18, 2026 - 23:16 nvd

MEDIUM 4.4

DescriptionGitHub Advisory

InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. A stored cross-site scripting (XSS) vulnerability in the Sumex invoice view allows an authenticated user with client and invoice management privileges to execute arbitrary JavaScript in the browser of any user viewing the invoice. This can lead to session hijacking, data theft, or other malicious actions on behalf of the victim user. Version 1.7.1 patches the issue.

AnalysisAI

Stored XSS in InvoicePlane's Sumex invoice view enables authenticated users with invoice management privileges to inject malicious JavaScript that executes in other users' browsers, potentially compromising sessions and enabling data theft. Public exploit code exists for this vulnerability. Version 1.7.1 and later contain the fix.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Invoiceplane. InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. A stored cross-site scripting (XSS) vulnerability in the Sumex invoice view allows an authenticated user with client and invoice management privileges to execute arbitrary JavaScript in the browser of any user viewing the invoice. This can lead to session hijacking, data theft, or other malicious actions on behalf of the victim user. Version 1.7.1 patches the issue.

RemediationAI

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