CVE-2026-102877

EUVD-2026-89412
Fider before 0.38.0 contains a server-side request forgery vulnerability due to a time-of-check time-of-use gap in URL validation for webhooks and custom OAuth provider endpoints. Administrators controlling DNS can perform DNS rebinding attacks to make the Fider server send requests to internal services or cloud metadata endpoints.
SSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.4 MEDIUM
NETWORK
HIGH
HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Common Weakness Enumeration
References
https://github.com/getfider/fider
https://github.com/getfider/fider/blob/v0.37.0/app/pkg/validate/general.go
https://github.com/getfider/fider/blob/v0.37.0/app/services/httpclient/httpclient.go
https://github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69
https://github.com/getfider/fider/releases/tag/v0.38.0
https://github.com/getfider/fider/security/advisories/GHSA-whx4-hxwq-qgjh
https://www.vulncheck.com/advisories/fider-before-0.38.0-ssrf-via-dns-rebinding-in-webhook-validation