BUG-000187331 Portal for ArcGIS has a security vulnerability

published 2026-10-13 26 d ago modified 2026-10-16 23 d ago also EUVD-2026-98842

cvss: 9.8; 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 31%
public exploits: 0; none known

A flaw in Portal for ArcGIS allows unauthenticated access to

certain Portal Administrator API endpoints under specific conditions. This could enable an attacker to access administrative functionality that should require authentication.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 27 d ago (2026-10-13)

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Esri Portal for ArcGIS

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

References

esri.com /arcgis-blog/products/trust-arcgis/administration/september-2026-arcgis-security-bulletin

Sources

CVE List CVE-2026-69227
NVD CVE-2026-69227

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary