Executive Summary

CVE-2026-49949 is a credential forwarding vulnerability in CodexBar versions before 0.33.0. It allows network-adjacent attackers to intercept sensitive credentials by exploiting cross-origin or HTTP-downgrade redirects in the shared ProviderHTTPClient transport.

Attackers can manipulate redirects to send credentialed provider requests—carrying browser cookies, bearer tokens, or API keys—to unintended hosts, ports, or plaintext HTTP destinations, thereby capturing those sensitive credentials.

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive credentials such as browser cookies, bearer tokens, or API keys.

An attacker positioned on the same network can intercept these credentials by forcing redirects to malicious or unintended destinations, potentially gaining unauthorized access to user accounts or services.

Such credential leakage can compromise user privacy, allow impersonation, and lead to further exploitation of affected systems or services.

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Detection Guidance

This vulnerability involves credential forwarding via cross-origin or HTTP-downgrade redirects in the CodexBar ProviderHTTPClient transport. Detection would involve monitoring network traffic for unexpected redirects that carry sensitive credentials such as browser cookies, bearer tokens, or API keys to unintended hosts, ports, or plaintext HTTP destinations.

To detect this on your system or network, you can monitor HTTP(S) requests made by CodexBar or related processes and look for redirect responses (HTTP 3xx status codes) that lead to different origins or downgrade from HTTPS to HTTP.

Suggested commands include using network traffic capture tools such as tcpdump or Wireshark to filter HTTP redirect responses and analyze the destination URLs:

• tcpdump -i <interface> -A 'tcp port 80 or tcp port 443 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
• Use Wireshark to filter HTTP response codes with: http.response.code == 301 || http.response.code == 302 || http.response.code == 307 || http.response.code == 308

Additionally, inspecting application logs or enabling verbose/debug logging in CodexBar (if supported) to track redirect URLs and their origins can help identify suspicious redirect behavior.

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Mitigation Strategies

The primary mitigation is to upgrade CodexBar to version 0.33.0 or later, where the vulnerability has been fixed by introducing a redirect guard mechanism that blocks cross-origin and HTTP-downgrade redirects carrying credentials.

This fix ensures that provider HTTP requests only follow same-origin HTTPS redirects, preventing credential leakage to unintended hosts, ports, or plaintext HTTP destinations.

• Upgrade CodexBar to version 0.33.0 or newer.
• If upgrading immediately is not possible, consider restricting network access to prevent network-adjacent attackers from intercepting or redirecting traffic.
• Monitor and audit network traffic for suspicious redirects as a temporary detection measure.

Applying the patch or update is the most effective and recommended step to mitigate this vulnerability.

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