CVE-2026-102877 Fider before 0.38.0 SSRF via DNS rebinding in webhook validation
Attackers can exploit DNS rebinding in webhook validation to force the Fider server to access internal services or cloud metadata endpoints.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102877?
CVE-2026-102877 is a low-severity server-side request forgery vulnerability in getfider fider, published on 29 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-102877?
How do I fix CVE-2026-102877?
No fix has been published for CVE-2026-102877 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-102877 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-102877 exists.
Sources
Also known as GHSA-j753-jwgq-fwxj, GHSA-whx4-hxwq-qgjh.