CVE-2026-85181
CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-565 |
| Vendor | dianping |
| Product | cat |
| Published | Sep 3, 2026 |
| Last Updated | Sep 3, 2026 |
Stay Ahead of the Next One
Get instant alerts for dianping cat
Be the first to know when new critical vulnerabilities affecting dianping cat are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
dianping / cat
0 ≤ 3.1.0
References
github.com: https://github.com/dianping/cat/issues/2384 github.com: https://github.com/dianping/cat github.com: https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/system/page/login/service/TokenBuilder.java github.com: https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util/HttpUtils.java vulncheck.com: https://www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkeyed-hashcode-checksum
Credits
🔍 George Chen