EUVD-2026-64085
GHSA-m7mf-cx6j-4wpj
Severity by source
AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
PR:H confirmed by description; UI:R added because injected HTML requires a second administrator to view the output for meaningful impact to be realized.
Primary rating from Vendor (Esri).
CVSS VectorNVD
Lifecycle Timeline
3DescriptionNVD
There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 11.3 and prior that allows a remote attacker with administrative privileges to insert arbitrary HTML into an administrative API. Users working with ArcGIS Enterprise 11.1, and 11.3 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 11.3 enables a remote attacker holding administrative credentials to insert arbitrary HTML into an administrative API endpoint, with potential to mislead or deceive other administrators viewing the rendered output. The CVSS score of 3.8 (Low) reflects the high privilege prerequisite (PR:H), which confines realistic exploitation to scenarios involving compromised admin accounts, rogue insiders, or privilege escalation chains. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a fully authenticated administrative account on the Portal for ArcGIS instance - CVSS PR:H confirms this is the entry bar. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 3.8 (Low) is consistent with the CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N vector, where the high privilege requirement (PR:H) is the dominant risk-limiting factor. … 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; no exact patched version number is specified in the available advisory data, so administrators should consult the August 2026 ArcGIS Security Bulletin at https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/august-2026-arcgis-security-bulletin for the definitive target version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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