CVE-2026-33520— BUG-000185167 - ArcGIS Server has a security vulnerability.

Quick assessment

Affected

Esri ArcGIS Server

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Esri Portal for ArcGIS 12.1 及更早版本中存在反射型跨站脚本（XSS）漏洞。该漏洞可能允许远程、未认证的攻击者构造恶意链接；当受害者点击该链接时，攻击者可能在受害者的浏览器中执行任意 JavaScript 代码。对于处于“正式可用（General Availability）”和“扩展支持（Extended support）”状态的受影响 ArcGIS Server 软件（包括 11.5 版本），已提供相应的补丁。其他版本处于“成熟（mature）”或“已退役（retired）”状态，不符

CVSS 6.1 · Medium Updated Oct 27, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

BUG-000185167 - ArcGIS Server has a security vulnerability.

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Esri	ArcGIS Server	11.1 ~ 12.1	-

II. Public POCs for CVE-2026-33520

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-33520

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Other References for CVE-2026-33520 (1)

https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/october-2026-arcgis-security-bulletin

https://www.cve.org/CVERecord?id=CVE-2026-33520

Same Patch Batch · Esri · 2026-10-26 · 6 CVEs total

CVE-2026-10757	9.8 CRITICAL	BUG-000187511 - ArcGIS Server has a security vulnerability.
CVE-2026-33521	7.5 HIGH	BUG-000186514 - ArcGIS Server has a security vulnerability.
CVE-2026-50096	6.1 MEDIUM	BUG-000187164 - ArcGIS Server has a security vulnerability.
CVE-2026-50095	6.1 MEDIUM	BUG-000187165 - ArcGIS Server has a security vulnerability.
CVE-2026-33522	5.3 MEDIUM	BUG-000182936 - ArcGIS Server has a security vulnerability.

IV. Related Vulnerabilities

Same product: ArcGIS Server

Same vendor: Esri

Same weakness: CWE-79