EUVD-2026-64082
GHSA-hhqc-95hf-p95p
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires victim to browse affected content (UI:R); injecting the payload requires a high-privilege portal account (PR:H); scope change reflects impact on victims' browser sessions.
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, 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 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 11.1 through 11.5 permits a remote attacker holding high portal privileges to persist malicious JavaScript payloads in portal content. When any other authenticated user browses the affected item, the injected script executes in their browser, enabling session hijacking, credential exfiltration, or portal actions performed on the victim's behalf. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a high-privilege Portal for ArcGIS account with permission to create or edit portal content - such as publisher, content manager, or administrator roles - as confirmed by PR:H in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) is underpinned by vector AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N. … 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's advisory at https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/august-2026-arcgis-security-bulletin recommends upgrading to the latest long-term support release of ArcGIS Enterprise; however, the exact fixed version number is not specified in the available data and should be confirmed directly from the bulletin. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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