CVE-2026-85181 CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum
Attackers can forge session cookies using weak checksums and bypass IP checks to gain admin access in CAT monitoring systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85181?
CVE-2026-85181 is a critical authentication bypass vulnerability in dianping cat, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-565
Which versions are affected by CVE-2026-85181?
How do I fix CVE-2026-85181?
No fix has been published for CVE-2026-85181 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-85181 being exploited?
There is no known exploitation of CVE-2026-85181 in the wild and no public exploit code.
Sources
Also known as GHSA-xrx5-jvp4-rqmj.