TI-2021-09996 Aliases CVE-2021-29109 GHSA-4vmq-mwqh-599r

Cross-site scripting in Esri Portal for ArcGIS

LOW 29CWE-79Published 2021-10-01 · Updated 2025-04-10

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

A reflected XSS vulnerability in Esri Portal for ArcGIS version 10.9 and below may allow a remote attacker able to convince a user to click on a crafted link which could potentially execute arbitrary JavaScript code in the user’s browser.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00744 54th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Esri	Portal for ArcGIS	All – 10.9	—	No fix listed	CNA

Portal for ArcGIS VendorEsri Affected All – 10.9 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:esri:portal_for_arcgis::::::::	up to 10.9	Vulnerable	Esri

cpe:2.3:a:esri:portal_for_arcgis:*:*:*:*:*:*:*:* Versions up to 10.9 Vulnerable ·Esri

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-29109
2026-10-03 Alias added: GHSA-4vmq-mwqh-599r

References

Patch 1

https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/Portal-for-ArcGIS-Security-2021-Update-1-Patch/

TI-2024-16901 Portal for ArcGIS has a directory traversal vulnerability. CVSS 3.1CRITICAL 9.9
TI-2026-11074 Missing authentication in Esri Portal for ArcGIS CVSS 3.1CRITICAL 9.8
TI-2025-02208 BUG-000174336 CVSS 3.1CRITICAL 9.8
TI-2026-25915 Incorrect privilege assignment in Portal for ArcGIS CVSS 3.1CRITICAL 9.8
TI-2026-25914 Incorrect privilege assignment in Portal for ArcGIS CVSS 3.1CRITICAL 9.8
TI-2025-04452 Server Side Request Forgery (SSRF) vulnerability in Portal for ArcGIS CVSS 3.1CRITICAL 9.1

See all 87 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences