TI-2026-65530 Aliases CVE-2026-102877 GHSA-j753-jwgq-fwxj

Fider before 0.38.0 SSRF via DNS rebinding in webhook validation

MEDIUM 44CWE-918Published 2026-09-29 · Updated 2026-09-30

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00209 11th percentileScored 2026-11-07

Fix Fixed fider (getfider): 0.38.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
getfider	fider	before 0.38.0	0.38.0	Patch available	CNA

fider Vendorgetfider Affected before 0.38.0 Fixed in 0.38.0 Patch available CNA

Remediation

Fix · CNA fider (getfider) Fixed in 0.38.0

Timeline

2026-10-02 Threatist record created from CVE-2026-102877
2026-10-03 Alias added: GHSA-j753-jwgq-fwxj

References

Patch 1

https://github.com/getfider/fider/commit/45f5627b9fd15b912fb9092635c863fb4c91dd69

Advisory 1

GitHub Security Advisory (GHSA-whx4-hxwq-qgjh)

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences