Medium severity · published May 20, 2026
CVE-2026-2812
Improper Authentication issue in ArcGIS Server
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
ArcGIS Server · Esri
11.1 through 12.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2812
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-2812
Vendor Advisory
https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin
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