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  4. CVE 2026 110802 altair dom based xss via attacker controlled
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Back to active CVEs
Medium · CVSS 6.1CVE-2026-110802

Altair: DOM-based XSS via attacker-controlled script URLs in the iframe sandboxCVE-2026-110802

Answer in brief

CVE-2026-110802 records a Medium severity (CVSS 6.1) vulnerability in Altair: DOM-based XSS via attacker-controlled script URLs in the iframe sandbox. The current sources do not mark it as known exploited. The current feed maps altair-graphql/altair (generic), altair-graphql/altair-express-middleware (generic), altair-graphql/altair-fastify-plugin (generic), altair-graphql/altair-koa-middleware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 5, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79, CWE-829
Source
CVE List V5
Source checked
Nov 5, 2026
References
4 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.1
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps altair-graphql/altair (generic), altair-graphql/altair-express-middleware (generic), altair-graphql/altair-fastify-plugin (generic), altair-graphql/altair-koa-middleware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
altair-graphql/altairgeneric>=7.2.4 <8.5.88.5.8
altair-graphql/altair-express-middlewaregeneric>=7.2.4 <8.5.88.5.8
altair-graphql/altair-fastify-plugingeneric>=7.2.4 <8.5.88.5.8
altair-graphql/altair-koa-middlewaregeneric>=7.2.4 <8.5.88.5.8
altair-graphql/altair-staticgeneric>=7.2.4 <8.5.88.5.8

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for altair-graphql/altair, altair-graphql/altair-express-middleware, altair-graphql/altair-fastify-plugin.
  2. 2Review the reported fix. Update altair-graphql/altair to 8.5.8; altair-graphql/altair-express-middleware to 8.5.8; altair-graphql/altair-fastify-plugin to 8.5.8; altair-graphql/altair-koa-middleware to 8.5.8; altair-graphql/altair-static to 8.5.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Altair is a GraphQL client for all platforms. From 7.2.4 until 8.5.8, packages/altair-iframe-sandbox/src/main.ts reads plugin_sandbox_opts from the iframe-sandbox query string and passes attacker-controlled scriptUrls to injectScript() in packages/altair-core/src/utils/inject.ts, which creates script elements in the page. The intended parent iframe flow places the page in an iframe with sandbox allow-scripts and without allow-same-origin, but direct navigation to a crafted iframe-sandbox URL omits that isolation and executes the supplied script in the origin serving Altair. Exploitation requires a victim to open the crafted URL, and the resulting script can access script-readable storage and make same-origin requests according to the deployment's authentication and cookie controls. This issue is fixed in version 8.5.8.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Kubeflow Pipelines: Reflected XSS in the frontend pod information and events error responsesAlso CWE-79