# CVE-2026-85181

## Summary

- **CVE ID:** CVE-2026-85181
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-565
- **Published:** Sep 3, 2026
- **Last Modified:** Sep 3, 2026

## 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.

## Affected Products

- dianping — cat (0)

## References

- [CNA](https://github.com/dianping/cat/issues/2384)
- [CNA](https://github.com/dianping/cat)
- [CNA](https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/system/page/login/service/TokenBuilder.java)
- [CNA](https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util/HttpUtils.java)
- [CNA](https://www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkeyed-hashcode-checksum)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._