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CVE-2026-85181— CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum

Quick assessment

Affected
dianping cat
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.

dianping CAT是dianping组织开源的一款实时应用监控平台。 dianping CAT 3.1.0及之前版本存在会话机制问题漏洞，该漏洞源于使用Java String.hashCode作为会话cookie的唯一完整性检查且缺少服务端密钥，导致攻击者可以离线伪造有效校验和，并可设置x-forwarded-for头绕过IP绑定验证，从而创建具有完整配置访问权限的管理员会话。

CVSS 9.8 · Critical EPSS 0.38% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
dianping cat ≤ 3.1.0 affected
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I. Basic Information for CVE-2026-85181

Vulnerability Information
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Vulnerability Title
CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum
Source: CVE Program / CVE List V5
Vulnerability Description
CAT uses Java String.hashCode as the sole integrity check for session cookies without server-side keying, allowing attackers to forge valid checksums offline. Attackers can set the x-forwarded-for header to bypass IP binding validation and create admin sessions with full configuration access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在信任Cookie未进行验证与完整性检查
Source: CVE Program / CVE List V5
Vulnerability Title
dianping CAT 会话机制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dianping CAT是dianping组织开源的一款实时应用监控平台。 dianping CAT 3.1.0及之前版本存在会话机制问题漏洞，该漏洞源于使用Java String.hashCode作为会话cookie的唯一完整性检查且缺少服务端密钥，导致攻击者可以离线伪造有效校验和，并可设置x-forwarded-for头绕过IP绑定验证，从而创建具有完整配置访问权限的管理员会话。
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
dianping cat 0 ~ 3.1.0 -

II. Public POCs for CVE-2026-85181

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III. Intelligence Information for CVE-2026-85181

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Patches & Fixes for CVE-2026-85181 (1)

Vendor Advisories for CVE-2026-85181 (1)

Other References for CVE-2026-85181 (3)

IV. Related Vulnerabilities

Same weakness: CWE-565

V. Comments for CVE-2026-85181

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