EUVD-2026-64086
GHSA-xv5h-ppvh-6vp3
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Description specifies a privileged attacker, so PR:L is more accurate than the provided PR:N; no availability impact applies.
Primary rating from Vendor (Esri).
CVSS VectorVendor: Esri
Lifecycle Timeline
1DescriptionCVE.org
There is a stored cross site scripting issue in Esri Portal for ArcGIS versions 12.1 and prior that may allow a remote, privileged attacker to inject malicious code that could potentially execute arbitrary JavaScript in a victim’s browser. Users working with ArcGIS Enterprise 11.1, 11.3, 11.5, 12.0 or 12.1 are encouraged to patch. All users are advised to upgrade to the latest long-term support release and apply the patch.
AnalysisAI
Stored cross-site scripting in Esri Portal for ArcGIS versions 11.1 through 12.1 enables a remote, privileged attacker to persist malicious JavaScript in the portal, which then executes in the browsers of users who subsequently view the affected content. The vulnerability carries a CVSS 3.1 score of 6.1 (Medium) with scope change (S:C), meaning successful exploitation crosses trust boundaries into victims' browser sessions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVE description specifies a 'remote, privileged attacker,' indicating that exploitation requires an existing account with sufficient portal privileges to create or edit content - this is the primary limiting condition. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.1 Medium score reflects a real but bounded risk profile: network-accessible (AV:N), low complexity (AC:L), no required privileges per the NVD vector (PR:N), requires user interaction (UI:R), and yields limited confidentiality and integrity impact (C:L/I:L) with scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patch released by Esri in the August 2026 ArcGIS Security Bulletin, available at https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/august-2026-arcgis-security-bulletin. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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