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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-110802
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 21:18:35 UTC
Updated2026-11-05 21:18:35 UTC
DescriptionAltair 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

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

Problem Types: CWE-79 | CWE-829 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-829 CWE-829: Inclusion of Functionality from Untrusted Control Sphere

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Altair-graphql Altair affected >= 7.2.4, < 8.5.8 Not specified
CNA Altair-graphql Altair-express-middleware affected >= 7.2.4, < 8.5.8 Not specified
CNA Altair-graphql Altair-fastify-plugin affected >= 7.2.4, < 8.5.8 Not specified
CNA Altair-graphql Altair-koa-middleware affected >= 7.2.4, < 8.5.8 Not specified
CNA Altair-graphql Altair-static affected >= 7.2.4, < 8.5.8 Not specified

References

ReferenceSourceLinkTags
github.com/altair-graphql/altair/releases/tag/v8.5.8 [email protected] github.com
github.com/altair-graphql/altair/commit/bdf422bdaaaf3186170ba7f22e22c259... [email protected] github.com
github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf [email protected] github.com
github.com/altair-graphql/altair/commit/53a19183ce11ca147bb990c355e14ecb... [email protected] github.com
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