Session Cookie Forgery in CAT by Dianping
CVE-2026-85181

9.3CRITICAL

Key Information:

Vendor

Dianping

Status
Cat
Vendor
CVE Published:
3 September 2026

What is CVE-2026-85181?

The vulnerability in CAT allows attackers to exploit an insufficient integrity check on session cookies, using Java String.hashCode without server-side keying. This enables them to forge valid checksums offline. Additionally, by manipulating the x-forwarded-for header, attackers can bypass IP binding validation, leading to the creation of unauthorized admin sessions with full access to configurations.

Affected Version(s)

cat 0 <= 3.1.0

References

https://github.com/dianping/cat/issues/2384
issue-tracking
https://github.com/dianping/cat
product
https://github.com/dianping/cat/blob/3.1.0/cat-home/src/m...
technical-description

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.