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Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

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

Medium 6.1

In plain English

A medium-severity cross-site scripting in altair from altair-graphql. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 87.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
altair-graphql altair >= 7.2.4, < 8.5.8
altair-graphql altair-express-middleware >= 7.2.4, < 8.5.8
altair-graphql altair-fastify-plugin >= 7.2.4, < 8.5.8
altair-graphql altair-koa-middleware >= 7.2.4, < 8.5.8
altair-graphql altair-static >= 7.2.4, < 8.5.8

Weakness: CWE-79, CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References