EUVD-2026-64158
GHSA-fx97-qx2h-j535
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
PR:H reflects mandatory admin access; UI:R assigned because stored XSS payload fires only when a victim loads the affected page, not autonomously.
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 allows a remote attacker holding administrative credentials to persistently inject malicious JavaScript that executes in the browsers of other portal users. The CVSS scope change (S:C) confirms the payload escapes the application's trust boundary and can affect lower-privileged users who simply load poisoned portal pages. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid account with administrative privileges on the targeted Portal for ArcGIS instance (CVSS PR:H confirms this). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS base score of 5.5 (Medium) reflects the mitigating factor of PR:H - exploitation requires pre-existing administrative access to the portal instance, substantially narrowing the realistic attacker pool to insiders, compromised admin accounts, or social-engineered administrators. … 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 | The primary remediation is to upgrade Portal for ArcGIS to the latest long-term support release, as directed by Esri's August 2026 ArcGIS Security Bulletin (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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