EUVD-2026-64159
GHSA-f6qv-fr5v-x7pj
Severity by source
AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
PR:H confirmed by description; UI:R applied over stated UI:N because victim page-view is the standard stored-XSS execution trigger.
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 allows a remote, privileged attacker to persist malicious JavaScript within the portal, which subsequently executes in the browsers of any user who views the affected content. The vulnerability carries a CVSS 3.1 score of 5.5 with scope change (S:C), reflecting that exploitation crosses from the portal server into victim browser sessions, enabling session hijacking, credential harvesting, or unauthorized portal actions on behalf of victims. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker hold a privileged account on the Portal for ArcGIS instance with write permissions sufficient to store content that is later rendered to other users - this is confirmed by the CVSS PR:H metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 score of 5.5 (Medium) reflects the significant constraint imposed by PR:H - the attacker must already possess a privileged account on the portal before they can store the malicious payload. … 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 that all users upgrade to the latest long-term support release of ArcGIS Enterprise; no specific patched version number is independently confirmed in the available data beyond Esri's advisory guidance. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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