CVE-2026-27210

MEDIUM
2026-02-21 [email protected] GHSA-8423-w5wx-h2r6
6.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
Patch Released
Mar 02, 2026 - 15:21 nvd
Patch available
CVE Published
Feb 21, 2026 - 06:17 nvd
MEDIUM 6.1

Tags

XSS Pannellum

Description

Pannellum is a lightweight, free, and open source panorama viewer for the web. In versions 3.5.0 through 2.5.6, the hot spot attributes configuration property allowed any attribute to be set, including HTML event handler attributes, allowing for potential XSS attacks. This affects websites hosting the standalone viewer HTML file and any other use of untrusted JSON config files (bypassing the protections of the escapeHTML parameter). As certain events fire without any additional user interaction, visiting a standalone viewer URL that points to a malicious config file - without additional user interaction - is sufficient to trigger the vulnerability and execute arbitrary JavaScript code, which can, for example, replace the contents of the page with arbitrary content and make it appear to be hosted by the website hosting the standalone viewer HTML file. This issue has been fixed in version 2.5.7. To workaround, setting the Content-Security-Policy header to script-src-attr 'none' will block execution of inline event handlers, mitigating this vulnerability. Don't host pannellum.htm on a domain that shares cookies with user authentication to mitigate XSS risk.

Analysis

Pannellum 2.5.0 through 2.5.6 allows arbitrary JavaScript execution through improperly sanitized hotspot configuration attributes in JSON files, enabling stored XSS attacks against users viewing panorama viewers with malicious configurations. An attacker can craft a malicious config file that executes code automatically upon page load without user interaction, potentially allowing page defacement or credential theft. …

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Remediation

Within 30 days: Identify affected systems running versions 3.5.0 and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

31
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +30
POC: 0

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CVE-2026-27210 vulnerability details – vuln.today
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