How broadly exploitable is this vulnerability?

The vulnerability is exploitable in any deployment where multiple users can access the same Streamlit instance. If an attacker can start a session after another user has entered their token, they may be able to harvest that token, even without authentication, depending on how the app exposes or reuses the stored values.

What level of access does an attacker need to exploit this?

An attacker typically only needs network access to the Streamlit application. They do not need shell access or control over the host; instead, they exploit the shared process environment through the application's own behavior.

What is the safest general fix pattern?

Stop using `os.environ` or other process-global state for storing user-specific credentials. Instead, handle tokens in per-session or per-request scope, or store them in a secure, access-controlled backend where retrieval is strictly tied to the authenticated user identity.

Severity:

HIGH RISK

(8.2)

Cross-Session Credential Exposure (CWE-200) in Streamlit-based GitHub MCP Agent

CVE-2026-29872

Published:

Mar 30, 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 Disclosure

CWE:

CWE-200;CWE-284;CWE-522

Impact:

Exposure of Sensitive Authentication Credentials

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Information Disclosure

CWE:

CWE-200;CWE-284;CWE-522

Impact:

Exposure of Sensitive Authentication Credentials

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

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Cross-Session Credential Exposure (CWE-200) in Streamlit-based GitHub MCP Agent

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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