EUVD-2026-64153
GHSA-5v9j-3f6c-93pf
Severity by source
AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Network-accessible portal requiring high-privilege credentials and victim page-load interaction, with limited confidentiality and integrity impact and no availability effect.
Primary rating from Vendor (Esri).
CVSS VectorVendor: Esri
Lifecycle Timeline
1DescriptionCVE.org
There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 11.5 and prior that allows a remote, highly priviliged attacker to insert arbitrary HTML into the Portal for ArcGIS Home application. 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
HTML injection in Esri Portal for ArcGIS versions 11.1 through 11.5 permits a remote, highly privileged attacker to insert arbitrary HTML into the Portal Home application, potentially delivering spoofed UI content or phishing material to other authenticated users. The CVSS vector (PR:H, UI:R, S:U) substantially constrains real-world impact: exploitation demands administrative-level credentials and victim interaction, with no availability impact and limited confidentiality or integrity effect. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a highly privileged account within the Portal for ArcGIS instance - specifically a portal administrator or equivalent role - as confirmed by the CVSS PR:H metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.5 Low score accurately reflects the compounded access constraints encoded in the vector AV:N/AC:L/PR:H/UI:R/S:U/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 | The primary remediation is to upgrade to the latest long-term support release of ArcGIS Enterprise, as directed by Esri in the 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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