Improper Authentication issue in ArcGIS Server

published 2026-05-20 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-31147

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 5 mo ago (2026-05-20)

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

Esri ArcGIS Server

Classification

Weakness

CWE-287 Improper Authentication

References

esri.com /arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin
vendor-advisory

Sources

CVE List CVE-2026-2812
NVD CVE-2026-2812

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Summary