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CVE-2026-90882— Reflected arbitrary origins with credentials, allowing cross-origin reads of authenticated user data

Quick assessment

Affected
Eclipse Foundation open-vsx.org
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The open-vsx.org deployment returned Access-Control-Allow-Origin reflecting the requesting origin together with Access-Control-Allow-Credentials: true on the authenticated /user/ endpoints. A page on any origin could therefore issue credentialed requests to th

CVSS 8.7 · High EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
Eclipse Foundation open-vsx.org 29/04/2026≤ 07/09/2026 affected
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I. Basic Information for CVE-2026-90882

Vulnerability Information

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Vulnerability Title
Reflected arbitrary origins with credentials, allowing cross-origin reads of authenticated user data
Source: CVE Program / CVE List V5
Vulnerability Description
The open-vsx.org deployment returned Access-Control-Allow-Origin reflecting the requesting origin together with Access-Control-Allow-Credentials: true on the authenticated /user/ endpoints. A page on any origin could therefore issue credentialed requests to the service in a logged-in user's browser and read the responses. This exposed /user (login name, avatar, homepage, tokens URL), /user/tokens, /user/namespaces, /user/extensions, /user/search/{name} and /user/namespace/{name}/members, and — because /user/csrf was readable the same way — allowed the CSRF protection on write endpoints to be defeated. Chaining the two, an attacker page could call /user/token/create and exfiltrate a personal access token carrying publish and delete rights over the victim's namespaces. The headers were emitted by the CDN/edge layer, not by the application: the Open VSX software sets allowCredentials(true) in exactly one place, against a single exact origin derived from ovsx.webui.url, and defines no CORS mapping on /user/ beyond it. No configuration of the software produces origin reflection with credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation open-vsx.org 29/04/2026 ~ 07/09/2026 -

II. Public POCs for CVE-2026-90882

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III. Intelligence Information for CVE-2026-90882

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Other References for CVE-2026-90882 (1)

IV. Related Vulnerabilities

Same vendor: Eclipse Foundation
Same weakness: CWE-942

V. Comments for CVE-2026-90882

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