CVE-2026-2812 Improper Authentication issue in ArcGIS Server
An unauthenticated attacker can disrupt the web interface of ArcGIS Server by exploiting an improper authentication flaw in an undocumented administrative endpoint.
- 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-2026-2812?
CVE-2026-2812 is a medium-severity authentication bypass vulnerability in Esri Arcgis Server, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ArcGIS Server contains an improper authentication vulnerability in an undocumented administrative endpoint. An unauthenticated attacker could exploit this issue by sending a crafted request to the endpoint. Successful exploitation may result in disruption of the web-based browsing interface. This issue affects ArcGIS Server 12.0 and earlier.
Weakness: CWE-287
Which versions are affected by CVE-2026-2812?
It affects 1 product.
Products include Esri Arcgis Server.
How do I fix CVE-2026-2812?
No fix has been published for CVE-2026-2812 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-2026-2812 being exploited?
There is no known exploitation of CVE-2026-2812 in the wild and no public exploit code.
Other vulnerabilities in Esri Arcgis Server
- CVE-2025-57870 BUG-000179884 - There is a security vulnerability in ArcGIS Server Feature Services.
- CVE-2026-9181 Directory Traversal in ArcGIS Server
- CVE-2026-9182 Unvalidated File Upload vulnerability in ArcGIS Server.
- CVE-2020-35712 Server-side request forgery in n/a
- CVE-2021-29102 There is a Server-Side Request Forgery (SSRF) vulnerability in Esri ArcGIS Server Manager version 10.8.1 and below.
Sources
Also known as GHSA-3wjj-6pp2-788h.