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TI-2026-80538 Aliases CVE-2026-33520GHSA-g9fm-vqgf-6f8x

Reflected cross-site scripting in Esri ArcGIS Server

Priority LOW 27CWE-79Published · Updated

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
Fixed

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

Summary

Esri ArcGIS Server from 11.1 before 12.1 contains a reflected cross-site scripting flaw (CWE-79). A remote, unauthenticated attacker can create a crafted link that, when a victim clicks it, runs arbitrary JavaScript in the victim's browser, which requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

There is a reflected cross site scripting vulnerability in Esri Portal for ArcGIS versions 12.1 and prior which may allow a remote, unauthenticated attacker to create a crafted link which when clicked could potentially execute arbitrary JavaScript code in the victim’s browser. A patch is provided for impacted ArcGIS Server software in General Availability and Extended support status, which includes versions 11.5. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00251 16th percentileScored 2026-11-07
Fix Fixed ArcGIS Server (Esri): 12.1

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

VendorProductAffected versionsFixed inStatusSource
EsriArcGIS Server11.1 to before 12.112.1Patch availableCNA
  • ArcGIS Server VendorEsri Affected 11.1 to before 12.1 Fixed in 12.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:esri:arcgis_server:*:*:*:*:*:*:*:*——Esri
  • cpe:2.3:a:esri:arcgis_server:*:*:*:*:*:*:*:* Versions — — ·Esri

Remediation

Upgrade Esri ArcGIS Server to version 12.1, the listed fixed version. A patch is also provided for ArcGIS Server in General Availability and Extended support, including version 11.5. Other versions are in mature or retired status and are not patch eligible, so users of unlisted versions should upgrade and apply the patch.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA ArcGIS Server (Esri) Fixed in 12.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Esri ArcGIS Server 12.1

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-80537 SQL injection in Esri ArcGIS Server exposes database functionsPriority MEDIUM 49
    • TI-2026-80542 Reflected cross-site scripting in Esri ArcGIS ServerPriority LOW 27
    • TI-2026-80541 Stored cross-site scripting in Esri ArcGIS ServerPriority LOW 27
    Show all 4 records →

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-33520
  2. 2026-10-26 CISA SSVC decision points changed
  3. 2026-10-26 Priority changed: MEDIUM → LOW
  4. 2026-10-27 Alias added: GHSA-g9fm-vqgf-6f8x

References

Other 1

  • TI-2024-16901 Portal for ArcGIS has a directory traversal vulnerability. CVSS 3.1CRITICAL 9.9
  • TI-2012-01450 ESRI ArcMap 9 and ArcGIS 10.0.2.3200 and earlier does not properly prompt users before… CVSS 2.0HIGH 9.3
  • TI-2007-01695 Buffer overflow in the ArcSDE service (giomgr) in Environmental Systems Research… CVSS 2.0HIGH 10.0
  • TI-2026-08070 Directory Traversal in ArcGIS Server CVSS 3.1CRITICAL 9.8
  • TI-2026-11074 Missing authentication in Esri Portal for ArcGIS CVSS 3.1CRITICAL 9.8
  • TI-2025-35724 BUG-000179884 - There is a security vulnerability in ArcGIS Server Feature Services. CVSS 3.1CRITICAL 10.0
See all 194 →

Sources

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