EUVD-2026-64162
GHSA-64q2-3w7r-x65w
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
PR:H confirmed by admin-only injection; UI:R added because victim must browse to affected page for payload execution; S:C retained as script crosses to victim browser context.
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 11.5 and prior that may allow a remote, administratively privileged attacker to inject malicious code that could potentially execute arbitrary in a victim’s browser. Users working with ArcGIS Enterprise 11.1, 11.3, and 11.5 are encouraged to patch. All users are advised to upgrade to the latest long-term support release.
AnalysisAI
Stored cross-site scripting in Esri Portal for ArcGIS versions 11.5 and prior enables a remotely authenticated administrator to inject persistent malicious JavaScript that executes in other users' browsers upon page load. The scope change (S:C) in the CVSS vector confirms the attacker's injected payload crosses from the server context into victims' browser sessions, enabling session hijacking, credential theft, or DOM manipulation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an administratively privileged account on the target Portal for ArcGIS instance (confirmed by CVSS PR:H), accessible over the network (AV:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 appropriately reflects the high privilege prerequisite (PR:H), which is the dominant risk-reducing factor: exploitation requires the attacker to already hold administrative credentials on the Portal for ArcGIS instance. … 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 | Esri recommends upgrading to the latest long-term support release of ArcGIS Enterprise; the specific patched version is not independently confirmed from the available reference data beyond the vendor advisory 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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