Vulnerability in Dianping Cat
CVE-2026-85181
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/dianping/cat (product)
- github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/syst… (technical-description)
- github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util… (technical-description)
- github.com/dianping/cat/issues/2384 (issue-tracking)
- www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkey… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85181?
- CVE-2026-85181 is a critical-severity vulnerability in Dianping Cat, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 9.8/10. Published 2026-09-03.
- How severe is CVE-2026-85181?
- Critical severity. CVSS v3 base score is 9.8 out of 10.