CVE-2026-110802Altair: DOM-based XSS via attacker-controlled script URLs in the iframe sandbox
- 6.1MediumCVSS base score
- 0.22%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
- https://github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf (opens in a new tab)x_refsource_CONFIRMexploit
Timeline
ID reserved
By GitHub_M
- 22 days later
· 22 days later
Published
- 5 days later
· 5 days later
Public exploit appeared
A proof of concept or exploit was published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.
Affected products
- affected >= 7.2.4, < 8.5.8
altair-graphql · altair-express-middleware
- affected >= 7.2.4, < 8.5.8
altair-graphql · altair-fastify-plugin
- affected >= 7.2.4, < 8.5.8
altair-graphql · altair-koa-middleware
- affected >= 7.2.4, < 8.5.8
altair-graphql · altair-static
- affected >= 7.2.4, < 8.5.8
Affected packages
Affected packages4
From reviewed advisories of the GitHub Advisory Database.
- npmaltair-express-middlewareGHSA-752m-7p75-49gf (opens in a new tab)
- npmaltair-fastify-pluginGHSA-752m-7p75-49gf (opens in a new tab)
- npmaltair-koa-middlewareGHSA-752m-7p75-49gf (opens in a new tab)
- npmaltair-staticGHSA-752m-7p75-49gf (opens in a new tab)
References
References4
- https://github.com/altair-graphql/altair/security/advisories/GHSA-752m-7p75-49gf (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/altair-graphql/altair/commit/53a19183ce11ca147bb990c355e14ecb1dd7cd3e (opens in a new tab)x_refsource_MISC
- https://github.com/altair-graphql/altair/commit/bdf422bdaaaf3186170ba7f22e22c259072133d9 (opens in a new tab)x_refsource_MISC
- https://github.com/altair-graphql/altair/releases/tag/v8.5.8 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-117794 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-752m-7p75-49gf (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-110802)Record last updated .