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Fencer Vulns
medium 5.8

CVE-2021-29490 json

Unauthenticated GET requests through Remote Image endpoints

published 2021-05-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16088

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
71.7%
EPSS 71.7% chance of exploitation in 30 days, percentile 99.4%
public exploits
0
none known, plus a Nuclei check

Summary

Jellyfin is a free software media system that provides media from a dedicated server to end-user devices via multiple apps. Verions prior to 10.7.3 vulnerable to unauthenticated Server-Side Request Forgery (SSRF) attacks via the imageUrl parameter. This issue potentially exposes both internal and external HTTP servers or other resources available via HTTP `GET` that are visible from the Jellyfin server. The vulnerability is patched in version 10.7.3. As a workaround, disable external access to the API endpoints `/Items/*/RemoteImages/Download`, `/Items/RemoteSearch/Image` and `/Images/Remote` via reverse proxy, or limit to known-friendly IPs.

Patch / fix

  • jellyfin jellyfin 10.7.3

Exploit prediction

71.65% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Jellyfin 10.7.2 - Server Side Request Forgery nuclei detection template

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • jellyfin jellyfin

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.