# CVE-2026-2813: Esri ArcGIS Server Open Redirect in Login Workflow

Source: https://junglewise.ai/threats/cve-2026-2813-esri-arcgis-server-open-redirect-in-login-workflow  
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-2026-2813 · Severity: medium · CVSS 4.7 · Published 2026-05-20

Esri ArcGIS Server, a platform for sharing geographic information and maps, contains a security flaw in its login process. An attacker can trick a user into clicking a malicious link that redirects them from the legitimate ArcGIS login page to an untrusted, fraudulent website. This could be used in phishing campaigns to deceive users, though it does not allow the attacker to compromise the server itself or access internal data directly.

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

## Quick answers

**Is CVE-2026-2813 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-2813 being exploited in the wild.

**How severe is CVE-2026-2813?** Medium severity, with a CVSS score of 4.7, published 20 May 2026.

**Which products and versions are affected?** Esri ArcGIS Server 11.5.

**Is there a fix for CVE-2026-2813?** 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-2026-2813 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-2813?** 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 open redirect vulnerability exists in ArcGIS Server 11.5 due to insufficient input validation within the login redirection workflow. By crafting a specific request, a remote attacker can cause the application to redirect a user's browser to an arbitrary external URL after authentication. This is a client-side navigation issue that remains confined to the same security boundary, meaning no server-side compromise or cross-component impact is possible. Exploitation requires user interaction, typically in the form of a user clicking a malicious link. While the advisory mentions an 'authenticated attacker' in the description, the provided CVSS vector (PR:N) suggests no special privileges are required to craft the malicious link.

## Affected products

- Esri ArcGIS Server 11.5

## Timeline

- 2026-05-20: disclosed
- 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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