# CVE-2026-2812: Esri ArcGIS Server improper authentication in administrative endpoint

Source: https://junglewise.ai/threats/cve-2026-2812-esri-arcgis-server-improper-authentication-in-administrative  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-20. Updated: 2026-05-20  
License: CC BY 4.0 with a link back

CVE-2026-2812 · Severity: medium · CVSS 5.3 · Published 2026-05-20

ArcGIS Server, a platform used for creating and managing geographic information system (GIS) services, contains a security flaw in a hidden administrative component. An unauthorized person could send a specifically formatted request to this component without needing a password. If successful, this could allow the attacker to disrupt the web-based interface used to browse and access maps and data services.

Technologies: [Esri ArcGIS Server](https://junglewise.ai/threats/technologies/arcgis-server). Vendors: [Esri](https://junglewise.ai/threats/vendors/esri).

## Quick answers

**Is CVE-2026-2812 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-2812 being exploited in the wild.

**How severe is CVE-2026-2812?** Medium severity, with a CVSS score of 5.3, published 20 May 2026.

**Which products and versions are affected?** Esri ArcGIS Server 12.0 and earlier.

**Is there a fix for CVE-2026-2812?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-2812 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-2812?** Check whether you run Esri ArcGIS Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper authentication vulnerability (CWE-287) exists in an undocumented administrative endpoint within Esri ArcGIS Server. The flaw allows a remote, unauthenticated attacker to bypass security controls by sending a specially crafted network request to the affected endpoint. Successful exploitation can lead to the disruption of the web-based browsing interface, impacting the integrity of the management console. This issue affects ArcGIS Server version 12.0 and all prior versions. Users are advised to consult the Esri April 2026 security bulletin for remediation steps.

## Affected products

- Esri ArcGIS Server 12.0 and earlier

## Timeline

- 2026-05-20: disclosed: Initial publication of CVE-2026-2812
- 2026-05-20: advisory

## References

- [https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin](https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin)

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