Graylog 6.1–6.1.8 HTTP Input header auth bypass allows ingestion
CVE-2025-30373 Published on April 7, 2025

Graylog Authenticated HTTP inputs do ingest message even if Authorization header is missing or has wrong value
Graylog is a free and open log management platform. Starting with 6.1, HTTP Inputs can be configured to check if a specified header is present and has a specified value to authenticate HTTP-based ingestion. Unfortunately, even though in cases of a missing header or a wrong value the correct HTTP response (401) is returned, the message will be ingested nonetheless. To mitigate the vulnerability, disable http-based inputs and allow only authenticated pull-based inputs. This vulnerability is fixed in 6.1.9.

Github Repository NVD

Vulnerability Analysis

CVE-2025-30373 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
LOW

Weakness Type

What is an AuthZ Vulnerability?

The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

CVE-2025-30373 has been classified to as an AuthZ vulnerability or weakness.


Products Associated with CVE-2025-30373

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Graylog
 

Affected Versions

graylog2-server Version >= 6.1.0, < 6.1.9 is affected by CVE-2025-30373

Vulnerable Packages

The following package name and versions may be associated with CVE-2025-30373

Package Manager Vulnerable Package Versions Fixed In
maven org.graylog2:graylog2-server >= 6.1.0, < 6.1.9 6.1.9

Exploit Probability

EPSS
0.03%
Percentile
9.04%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.