VulnerabilityPublished 20 May 2026

CVE-2026-2813: Esri ArcGIS Server · Open Redirect

Affects Esri ArcGIS ServerSource CVE Database V5

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Not known to be exploited · CVSS 4.7 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

4.7Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
EsriArcGIS Server	Affected =11.5	Fixed in–

AI-suggested

Until an official fix is available, users should exercise caution with login redirections and verify URLs before following them. No official remediation or temporary fix has been published by Esri at this time.

Description

CVE-2026-2813 is an open redirect vulnerability in Esri ArcGIS Server version 11.5. It arises from insufficient input validation in the login redirection workflow, allowing an authenticated attacker to craft requests that redirect users to untrusted sites. The impact is limited to confidentiality under specific user interactions and does not affect server-side components or other security boundaries. The vulnerability has a medium severity rating with a CVSS score of 4.7. No official patch or remediation guidance has been provided yet by the vendor.

Impact

Successful exploitation may lead to users being redirected to untrusted external sites, potentially exposing them to phishing or other social engineering attacks. However, the vulnerability does not allow server-side compromise, data integrity loss, or availability impact. The confidentiality impact is limited and depends on user interaction with the malicious redirection.

Summary

ArcGIS Server 11.5 contains an input validation weakness in its login redirection logic, enabling authenticated attackers to cause the application to redirect browsers to unintended, potentially untrusted URLs. This open redirect vulnerability is confined to client-side navigation during authentication and does not compromise server-side components or cross-component security. The issue results in limited confidentiality impact contingent on user interaction.

References

esri.com/arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 May 2026, 21:02 UTC

Technical details

References

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