{"id":"CVE-2026-110802","title":"Altair: DOM-based XSS via attacker-controlled script URLs in the iframe sandbox","summary":"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() i…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-79","CWE-829"],"vendor":"altair-graphql","product":"altair","affected":["altair >= 7.2.4, < 8.5.8","altair-express-middleware >= 7.2.4, < 8.5.8","altair-fastify-plugin >= 7.2.4, < 8.5.8","altair-koa-middleware >= 7.2.4, < 8.5.8","altair-static >= 7.2.4, < 8.5.8"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:41:52.499Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110802","references":[{"url":"https://github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf","label":"https://github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf"},{"url":"https://github.com/altair-graphql/altair/commit/53a19183ce11ca147bb990c355e14ecb1dd7cd3e","label":"https://github.com/altair-graphql/altair/commit/53a19183ce11ca147bb990c355e14ecb1dd7cd3e"},{"url":"https://github.com/altair-graphql/altair/commit/bdf422bdaaaf3186170ba7f22e22c259072133d9","label":"https://github.com/altair-graphql/altair/commit/bdf422bdaaaf3186170ba7f22e22c259072133d9"},{"url":"https://github.com/altair-graphql/altair/releases/tag/v8.5.8","label":"https://github.com/altair-graphql/altair/releases/tag/v8.5.8"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.863Z","slug":"CVE-2026-110802","body":"## Overview\n\nAltair 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.\n\n## Affected\n\n- `altair >= 7.2.4, < 8.5.8`\n- `altair-express-middleware >= 7.2.4, < 8.5.8`\n- `altair-fastify-plugin >= 7.2.4, < 8.5.8`\n- `altair-koa-middleware >= 7.2.4, < 8.5.8`\n- `altair-static >= 7.2.4, < 8.5.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}