CVE-2026-21883
Description
A flaw was found in Bokeh, an interactive visualization library. A remote attacker could exploit flawed origin validation logic in WebSocket connections, which are used for real-time communication between a web browser and a server. By luring a victim to a malicious website, the attacker could bypass the server's security checks, establish a connection, and interact with the Bokeh server on the victim's behalf. This could lead to unauthorized access to sensitive data or modification of visualizations.
Statement
This vulnerability is rated Moderate for Red Hat OpenShift AI (RHOAI) as it affects Bokeh server applications with an allowlist configured. An attacker could exploit this by registering a malicious domain that appears to be a subdomain of an allowed origin, then luring a victim to visit it. This allows the attacker to initiate a WebSocket connection to the vulnerable Bokeh server, potentially accessing sensitive data or modifying visualizations on behalf of the victim.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.4 | 5.4 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability,Non-Repudiation,Access Control
Technical Impact: Varies by Context; Gain Privileges or Assume Identity; Bypass Protection Mechanism; Read Application Data; Modify Application Data; DoS: Crash, Exit, or Restart
The consequences will vary depending on the nature of the functionality that is vulnerable to CSRF. An attacker could effectively perform any operations as the victim. If the victim is an administrator or privileged user, the consequences may include obtaining complete control over the web application - deleting or stealing data, uninstalling the product, or using it to launch other attacks against all of the product's users. Because the attacker has the identity of the victim, the scope of the CSRF is limited only by the victim's privileges.
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