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TI-2021-09995 Aliases CVE-2021-29108GHSA-249c-5cfq-cwqh

Improper signature verification in Esri Portal for ArcGIS

Priority MEDIUM 42CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.

Summary

There is an privilege escalation vulnerability in organization-specific logins in Esri Portal for ArcGIS versions 10.9 and below that may allow a remote, authenticated attacker who is able to intercept and modify a SAML assertion to impersonate another account (XML Signature Wrapping Attack). In addition patching, Esri also strongly recommends as best practice for SAML assertions to be signed and encrypted.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00812 57th percentileScored 2026-11-07
Fix Fixed Portal for ArcGIS (Esri): <10.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
EsriPortal for ArcGIS10.9.0 to before <10.9.0<10.9.0Patch availableCNA
  • Portal for ArcGIS VendorEsri Affected 10.9.0 to before <10.9.0 Fixed in <10.9.0 Patch available CNA

CPE configurations NVD · 1

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

Remediation

  • Fix · CNA Portal for ArcGIS (Esri) Fixed in <10.9.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29108
  2. 2026-10-03 Alias added: GHSA-249c-5cfq-cwqh

References

Advisory 1

Other 1

  • 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