Is this vulnerability remotely exploitable?

Yes. Anyone who can supply or influence the payment Notes field, or call the PDF receipt endpoint with crafted data, can potentially trigger SSRF from the server.

What level of access does an attacker need?

Typically, the attacker needs at least application-level access to create or modify payments or invoke the receipt PDF endpoint. In some deployments where the endpoint is not well protected, even low-privileged or unauthenticated access could be enough.

What is the safest general fix pattern?

The safest approach is to prevent untrusted HTML from driving server-side network requests: sanitize or restrict HTML input, disable or tightly control remote resource fetching in Dompdf, and enforce outbound network restrictions so that application servers cannot freely access internal or sensitive endpoints.

Severity:

HIGH RISK

(7.6)

Server-Side Request Forgery (CWE-918) in InvoiceShelf Payment Receipt PDF Generation

CVE-2026-34366

Published:

Mar 31, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery and Internal Network Exposure

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery and Internal Network Exposure

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in InvoiceShelf Payment Receipt PDF Generation

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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