Is this vulnerability remotely exploitable?

Yes. An attacker can exploit this remotely by initiating an OIDC login flow using a `callback_mode=direct` role and then convincing the victim to open a crafted URL, which can silently finalize the attacker's session in the victim's browser context.

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

The attacker needs the ability to initiate JWT/OIDC authentication against the OpenBao instance using a role configured with `callback_mode=direct`, plus any common capability to send links or redirects to the victim (such as email, chat, or web content under their control).

What is the safest general fix pattern?

The safest pattern is to enforce an explicit user confirmation step before completing any authentication flow, particularly for direct callback modes. This can be done by adding a confirmation screen on the OpenBao side or ensuring the identity provider requires user confirmation for each session associated with OpenBao's client ID.

Severity:

CRITICAL RISK

(9.6)

Session Fixation via Direct OIDC Callback (CWE-384) in OpenBao JWT/OIDC Login

CVE-2026-33757

Published:

Mar 27, 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:

Session Management and Authentication Logic Flaw

CWE:

CWE-384

Impact:

Session Fixation and Account Compromise

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Session Management and Authentication Logic Flaw

CWE:

CWE-384

Impact:

Session Fixation and Account Compromise

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Session Fixation via Direct OIDC Callback (CWE-384) in OpenBao JWT/OIDC Login

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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