Is this vulnerability remotely exploitable?

Yes. If a client connects to a malicious or compromised server that uses cpp-httplib's vulnerable redirect handling, that server can issue redirects to attacker-controlled hosts and receive the client's credentials.

Does an attacker need prior access or authentication to exploit this?

The attacker primarily needs control over, or the ability to impersonate, a server that the client contacts. They do not need prior authentication to the client's target service; instead, they exploit the client's trust in redirects to capture the credentials.

What is the safest general fix pattern for affected applications?

The safest pattern is to prevent `Authorization` (and other sensitive) headers from being automatically reused across origins. On any redirect where host, scheme, or port changes, drop or re-evaluate credentials and only reattach them if the new origin is explicitly trusted and matches expected security constraints.

Severity:

HIGH RISK

(7.4)

Credential Exposure via Cross-Origin Redirects (CWE-200) in cpp-httplib HTTP Client

CVE-2026-33745

Published:

Mar 26, 2026

Status:

Analyzed

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:

Information Exposure / Credential Leakage

CWE:

CWE-200

Impact:

Exposure of Authentication Credentials to Unauthorized Hosts

Severity:

HIGH RISK

(7.4)

CVSS Version:

3.1

Vulnerability Type

Category:

Information Exposure / Credential Leakage

CWE:

CWE-200

Impact:

Exposure of Authentication Credentials to Unauthorized Hosts

Severity:

HIGH RISK

(7.4)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

Credential Exposure via Cross-Origin Redirects (CWE-200) in cpp-httplib HTTP Client

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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