CVE-2026-33518: An incorrect privilege assignment vulnerability exists in Esri Portal for ArcGIS 11.5 in Windows and Linux tha

This month

CRITICAL 9.8REMOTEWATCHLISTDOWNGRADE

CVE-2026-33518 is a critical-severity flaw (CVSS 9.8) affecting portal for arcgis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incorrect privilege assignment vulnerability exists in Esri Portal for ArcGIS 11.5 in Windows and Linux that allows highly privileged users to create developer credentials that may grant more privileges than expected.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-266
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): Environmental Systems Research Institute, Inc. · Vendor: esri

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 21:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

esri portal for arcgis DOWNGRADE

Affected: 11.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.5

1. Check installed version

apt-cache policy portal-for-arcgis || rpm -q portal-for-arcgis || portal-for-arcgis --version

2. No fixed release: DOWNGRADE to a release before 11.5 (Debian / Ubuntu)

apt-cache madison portal-for-arcgis sudo apt install portal-for-arcgis=<VERSION_BEFORE_11.5> sudo apt-mark hold portal-for-arcgis

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list portal-for-arcgis sudo dnf downgrade portal-for-arcgis-<VERSION_BEFORE_11.5> sudo dnf versionlock add portal-for-arcgis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33518?

portal for arcgis: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-33518 being exploited?

CVE-2026-33518 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33518 affect?

CVE-2026-33518 affects portal for arcgis. Severity is critical (CVSS 9.8). An incorrect privilege assignment vulnerability exists in Esri Portal for ArcGIS 11.5 in Windows and Linux that allows highly privileged users to create developer credentials that may grant more privileges than expected.

How urgent is CVE-2026-33518?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

CVE-2026-33519 CRITICAL 9.8 DOWNGRADE An incorrect authorization vulnerability exists in Esri Portal for ArcGIS 11.4, 11.5 and 12.0 on Windows, Linu
CVE-2026-13019 CRITICAL 9.8 UPGRADE Esri Portal for ArcGIS versions 12.1 and earlier on Windows, Linux and Kubernetes have a missing authenticatio
CVE-2026-13020 HIGH 8.1 UPGRADE A Weak Password Recovery Mechanism for Forgotten Password exists in Esri Portal for ArcGIS versions 12.1 and e
CVE-2026-69224 MEDIUM 5.9 UPGRADE There is an information disclosure vulnerability in Esri Portal for ArcGIS versions 12.0 and earlier that may
CVE-2026-69225 MEDIUM 5.9 DOWNGRADE There is an information disclosure vulnerability in Esri Portal for ArcGIS versions 11.5 through 12.0 and earl

References

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