CVE-2026-102877— Fider before 0.38.0 SSRF via DNS rebinding in webhook validation
Quick assessment
Affected
getfider fider
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 Fid
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I. Basic Information for CVE-2026-102877
Vulnerability Information
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Vulnerability Title
Fider before 0.38.0 SSRF via DNS rebinding in webhook validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-102877
| # | POC Description | Source Link | Shenlong Link |
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Other References for CVE-2026-102877 (7)
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https://github.com/getfider/fider/blob/v0.37.0/app/pkg/validate/general.go technical-description
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https://github.com/getfider/fider/blob/v0.37.0/app/services/httpclient/httpclient.go technical-description
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https://github.com/getfider/fider/releases/tag/v0.38.0 release-notes
IV. Related Vulnerabilities
Same weakness: CWE-918
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V. Comments for CVE-2026-102877
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