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CVE-2025-46827— Graylog Allows Session Takeover via Insufficient HTML Sanitization

Quick assessment

Affected
Graylog2 graylog2-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Graylog是美国Graylog公司的一套集中式日志管理解决方案。该产品支持捕获、存储和实时分析日志等。 Graylog 6.2.0之前版本存在跨站脚本漏洞，该漏洞源于事件定义修复步骤字段中可提交HTML表单获取用户会话cookie。

CVSS 8.0 · High EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2025-46827

Vulnerability Information
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Vulnerability Title
Graylog Allows Session Takeover via Insufficient HTML Sanitization
Source: CVE Program / CVE List V5
Vulnerability Description
Graylog is a free and open log management platform. Prior to versions 6.0.14, 6.1.10, and 6.2.0, it is possible to obtain user session cookies by submitting an HTML form as part of an Event Definition Remediation Step field. For this attack to succeed, the attacker needs a user account with permissions to create event definitions, while the user must have permissions to view alerts. Additionally, an active Input must be present on the Graylog server that is capable of receiving form data (e.g. a HTTP input, TCP raw or syslog etc). Versions 6.0.14, 6.1.10, and 6.2.0 fix the issue. No known workarounds are available, as long as the relatively rare prerequisites are met.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Graylog 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Graylog是美国Graylog公司的一套集中式日志管理解决方案。该产品支持捕获、存储和实时分析日志等。 Graylog 6.2.0之前版本存在跨站脚本漏洞，该漏洞源于事件定义修复步骤字段中可提交HTML表单获取用户会话cookie。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Graylog2 graylog2-server < 6.0.14 -

II. Public POCs for CVE-2025-46827

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III. Intelligence Information for CVE-2025-46827

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IV. Related Vulnerabilities

Same product: graylog2-server
Same vendor: Graylog2
Same weakness: CWE-79

V. Comments for CVE-2025-46827

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