Vulnerabilities in pkg:npm/pannellum

PACKAGE
Advisory Identifier: GHSA-8423-w5wx-h2r6
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Advisory Summary

CVE-2026-27210 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Pannellum libraries in the npm ecosystem. The issue involves pannellum has a xss vulnerability in hot spot attributes. Remediation is available by upgrading affected packages to version 2.5.7.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/pannellum

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/pannellum. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-8423-w5wx-h2r6 CVE-2026-27210 MODERATE Pannellum has a XSS vulnerability in hot spot attributes
GHSA-m52x-29pq-w3vv CVE-2019-16763 MODERATE Pannellum Cross-Site Scripting due to data not being sanitized for URIs or vbscript

CVE-2026-27210 at a Glance

CVE Identifier CVE-2026-27210
GHSA Identifier GHSA-8423-w5wx-h2r6
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Pannellum
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-27210

To remediate this vulnerability, upgrade all affected Pannellum dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pannellum fixed: 2.5.7 
npm install pannellum@2.5.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls pannellum

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-27210, inspect your project dependencies using npm:

npm ls pannellum

Analyze the terminal output to locate any version of Pannellum in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.7), your application is affected.

Note: The npm ls pannellum command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Pannellum, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. ### Patches This has been fixed both in v2.5.7 and in the current development branch. ### Workarounds 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. ### Acknowledgments Reported both by luminary (@lumin9ry), Visvge (@Sicclord1 / @Visvge), and sutol (@0x5a6163 / @SUT0L) and by another researcher who wishes not to be named at this time.

CVE-2026-27210 Affected Pannellum Versions

1 component(s)
Fixed Versions:
2.5.7
Product / Package Ecosystem Affected Versions Fixed Version
pannellum
npm/pannellum
npm
≥ 2.5.0
< 2.5.7
2.5.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/mpetroff/pannellum/security/advisories/GHSA-8423-w5wx-h2r6
NVD — CVE-2026-27210 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27210
Security Fix Commit FIX COMMIT
https://github.com/mpetroff/pannellum/commit/9391ef8da6a6a98c6a9f8c97f101adb900523681
Pannellum Source Repository REPOSITORY
https://github.com/mpetroff/pannellum

Frequently Asked Questions

What is CVE-2026-27210?
CVE-2026-27210 is a security vulnerability in Pannellum involving Pannellum has a XSS vulnerability in hot spot attributes under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Pannellum versions are affected?
Affected versions include releases prior to 2.5.7 across affected packages: pannellum.
What version fixes CVE-2026-27210?
Upgrading to 2.5.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pannellum affected?
Yes, pannellum is affected in releases prior to 2.5.7. Upgrade your dependency to 2.5.7 or later.
What CWE is associated with CVE-2026-27210?
CVE-2026-27210 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2026-27210?
Run the dependency tree command: 'npm ls pannellum'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8423-w5wx-h2r6",
  "modified" : "2026-02-23T22:27:55Z",
  "published" : "2026-02-19T20:44:48Z",
  "aliases" : [ "CVE-2026-27210" ],
  "summary" : "Pannellum has a XSS vulnerability in hot spot attributes",
  "details" : "### Impact\nThe 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&mdash;without additional user interaction&mdash;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.\n\n### Patches\nThis has been fixed both in v2.5.7 and in the current development branch.\n\n### Workarounds\nSetting 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.\n\n### Acknowledgments\n\nReported both by luminary (@lumin9ry), Visvge (@Sicclord1 / @Visvge), and sutol (@0x5a6163 / @SUT0L) and by another researcher who wishes not to be named at this time.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "pannellum"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "2.5.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/mpetroff/pannellum/security/advisories/GHSA-8423-w5wx-h2r6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27210"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mpetroff/pannellum/commit/9391ef8da6a6a98c6a9f8c97f101adb900523681"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mpetroff/pannellum"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-19T20:44:48Z",
    "nvd_published_at" : "2026-02-21T06:17:01Z"
  }
}