DOM-based XSS in Altair iframe sandbox runs attacker-supplied scripts
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting, Code execution
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79 and CWE-829.
Summary
Altair GraphQL client versions from 7.2.4 before 8.5.8 are affected, along with the altair-express-middleware, altair-fastify-plugin, altair-koa-middleware and altair-static packages. The iframe sandbox entry point takes attacker-controlled script URLs from its query string and injects them into the page, a DOM-based cross-site scripting flaw (CWE-79). If a victim opens a crafted URL directly, the injected script runs in the origin serving Altair, with access to script-readable storage and same-origin requests, subject to the deployment's authentication and cookie controls.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| altair-graphql | altair | 7.2.4 to before 8.5.8 | 8.5.8 | Patch available | CNA |
| altair-graphql | altair-express-middleware | 7.2.4 to before 8.5.8 | 8.5.8 | Patch available | CNA |
| altair-graphql | altair-fastify-plugin | 7.2.4 to before 8.5.8 | 8.5.8 | Patch available | CNA |
| altair-graphql | altair-koa-middleware | 7.2.4 to before 8.5.8 | 8.5.8 | Patch available | CNA |
| altair-graphql | altair-static | 7.2.4 to before 8.5.8 | 8.5.8 | Patch available | CNA |
- altair Vendoraltair-graphql Affected 7.2.4 to before 8.5.8 Fixed in 8.5.8 Patch available CNA
- altair-express-middleware Vendoraltair-graphql Affected 7.2.4 to before 8.5.8 Fixed in 8.5.8 Patch available CNA
- altair-fastify-plugin Vendoraltair-graphql Affected 7.2.4 to before 8.5.8 Fixed in 8.5.8 Patch available CNA
- altair-koa-middleware Vendoraltair-graphql Affected 7.2.4 to before 8.5.8 Fixed in 8.5.8 Patch available CNA
- altair-static Vendoraltair-graphql Affected 7.2.4 to before 8.5.8 Fixed in 8.5.8 Patch available CNA
Remediation
Upgrade altair, altair-express-middleware, altair-fastify-plugin, altair-koa-middleware and altair-static to version 8.5.8, which fixes the flaw.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA altair (altair-graphql) Fixed in 8.5.8
- Fix · CNA altair-express-middleware (altair-graphql) Fixed in 8.5.8
- Fix · CNA altair-fastify-plugin (altair-graphql) Fixed in 8.5.8
- Fix · CNA altair-koa-middleware (altair-graphql) Fixed in 8.5.8
- Fix · CNA altair-static (altair-graphql) Fixed in 8.5.8
Vendor assessments
Timeline
- 2026-11-05 Threatist record created from CVE-2026-110802
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
- 2026-11-07 Priority changed: MEDIUM → LOW
References
Other 4
- https://github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf
- https://github.com/altair-graphql/altair/commit/53a19183ce11ca147bb990c355e14ecb1dd7cd3e
- https://github.com/altair-graphql/altair/commit/bdf422bdaaaf3186170ba7f22e22c259072133d9
- https://github.com/altair-graphql/altair/releases/tag/v8.5.8
More altair-graphql vulnerabilities
- TI-2023-23490 The Altair Desktop Client Does Not Sanitize External URLs before passing them to the underlying system CVSS 3.1HIGH 7.8
- TI-2024-36262 Altair GraphQL Client's desktop app does not validate HTTPS certificates CVSS 3.1MEDIUM 6.8
Sources
- CVE-2026-110802 · CVE Program
- CVE-2026-110802 · NVD
- FIRST EPSS
- CVE-2026-110802 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences