Vulnerability · Published Nov 24, 2025 · Assigned by certcc
CVE-2025-12969CVE-2025-12969
Medium 6.5
In plain English
A medium-severity security flaw in Fluent Bit from FluentBit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| FluentBit | Fluent Bit | 0 – before 4.0.13 |