Chaskiq through 2.0.3 Unauthenticated SSRF via /oembed Endpoint

Advisories

Chaskiq through 2.0.3 Unauthenticated SSRF via /oembed Endpoint

Severity: medium
Date: 10/16/2026
Affecting: chaskiq <= 2.0.3
CVE: CVE-2026-111662
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
References: https://hackmd.io/@hieuPenguinnn/chaskiq-unauthenticated-ssrf-oembed-url-upload
https://github.com/chaskiq/chaskiq/blob/2.0.3/app/controllers/oembed_controller.rb#L8-L11
https://github.com/chaskiq/chaskiq/blob/2.0.3/app/services/fetch_link_card_service.rb#L11-L40
Credit: hieuPenguinnn
Description: Chaskiq through 2.0.3 contains a server-side request forgery vulnerability that allows unauthenticated attackers to make the server fetch arbitrary URLs via the url parameter of the /oembed endpoint. Attackers can target loopback, private, or cloud-metadata addresses through FetchLinkCardService, which follows redirects and skips TLS verification, to read internal page titles and descriptions.

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