SSRF in Getfider Fider
CVE-2026-102877
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/getfider/fider (product)
- github.com/getfider/fider/blob/v0.37.0/app/pkg/validate/general.go (technical-description)
- github.com/getfider/fider/blob/v0.37.0/app/services/httpclient/httpclient.go (technical-description)
- github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69 (patch)
- github.com/getfider/fider/releases/tag/v0.38.0 (release-notes)
- github.com/getfider/fider/security/advisories/GHSA-whx4-hxwq-qgjh (vendor-advisory)
- www.vulncheck.com/advisories/fider-before-0.38.0-ssrf-via-dns-rebinding-in-webh… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-102877?
- CVE-2026-102877 is a medium-severity vulnerability in Getfider Fider, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.4/10. Published 2026-09-29.
- How severe is CVE-2026-102877?
- Medium severity. CVSS v3 base score is 4.4 out of 10.