CVE-2025-12969CWE-306

CVE-2025-12969

Medium · published November 24, 2025

CVSS v3.1
6.5
EPSS
1%
Percentile
48.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00613 · 48.7th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2025-11-24T20:15Z
Affected products (1)
ProductVersionsFixed in
treasuredata/fluent_bitall versions—
References (2)
https://fluentbit.io/blog/2025/10/28/security-vulnerabilities-addressed-in-fluent-bit-v4.1-and-backported-to-v4.0/ · [email protected]https://www.oligo.security/blog/critical-vulnerabilities-in-fluent-bit-expose-cloud-environments-to-remote-takeover · [email protected]
EPSS history
Timeline
  • 24 NOV 14:41Z
    CVE-2025-12969
    cvelistv5