CVE-2025-12969
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-24

Last updated on: 2025-11-28

Assigner: CERT/CC

Description
Fluent Bit in_forward input plugin does not properly enforce the security.users authentication mechanism under certain configuration conditions. This allows remote attackers with network access to the Fluent Bit instance exposing the forward input to send unauthenticated data. By bypassing authentication controls, attackers can inject forged log records, flood alerting systems, or manipulate routing decisions, compromising the authenticity and integrity of ingested logs.
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Meta Information
Published
2025-11-24
Last Modified
2025-11-28
Generated
2026-06-16
AI Q&A
2025-11-24
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12969
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
treasuredata fluent_bit 4.1.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability in the Fluent Bit in_forward input plugin occurs because it does not properly enforce the security.users authentication mechanism under certain configurations. This flaw allows remote attackers with network access to the Fluent Bit instance exposing the forward input to send data without authentication, effectively bypassing security controls.

Impact Analysis

An attacker exploiting this vulnerability can inject forged log records, flood alerting systems, or manipulate routing decisions. This compromises the authenticity and integrity of the logs ingested by Fluent Bit, potentially leading to incorrect monitoring, alerting failures, or misdirected log data.

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