CVE-2026-2812

Description

ArcGIS Server contains an improper authentication vulnerability in an undocumented administrative endpoint. An unauthenticated attacker could exploit this issue by sending a crafted request to the endpoint. Successful exploitation may result in disruption of the web-based browsing interface. This issue affects ArcGIS Server 12.0 and earlier.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — Exploit Prediction

0.0008

Probability of exploitation

0.24%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-287 Improper Authentication

Affected Products

Vendor	Product	Versions
esri	arcgis_server	11.1 — 12.0
linux	linux_kernel	All
microsoft	windows	All

References

Advisories & Patches

https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/april2026_security_bulletin

Frequently Asked Questions

What is CVE-2026-2812? +

ArcGIS Server contains an improper authentication vulnerability in an undocumented administrative endpoint. An unauthenticated attacker could exploit this issue by sending a crafted request to the endpoint. Successful exploitation may result in disruption of the web-based browsing interface. This issue affects ArcGIS Server 12.0 and earlier. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-2812? +

CVE-2026-2812 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0008, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-2812? +

CVE-2026-2812 affects products from esri, linux, microsoft, specifically: arcgis_server, linux_kernel, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-2812? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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