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.
Does this matter?
Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 2.1 LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.21% probability · 11th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-918
- Source
- disclosure@vulncheck.com
EPSS moved from 0.2% on 30 September 2026 to 0.2% on 26 October 2026.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.