CVE-2026-85181CWE-565

CVE-2026-85181

Critical · published September 3, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
31.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · 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
EPSS
0.00382 · 31.3th percentile
Weakness
CWE-565 · Reliance on Cookies without Validation and Integrity Checking
Published
2026-09-03T19:17Z
References (5)
https://github.com/dianping/cat · [email protected]https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/system/page/login/service/TokenBuilder.java · [email protected]https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util/HttpUtils.java · [email protected]https://github.com/dianping/cat/issues/2384 · [email protected]https://www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkeyed-hashcode-checksum · [email protected]
EPSS history
Timeline
  • 05 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 03 SEP 14:12Z
    CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum
    cvelistv5