What is CVE-2026-27707?

CVE-2026-27707 is a high-severity vulnerability in Seerr, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.3/10. Published 2026-02-27.

How severe is CVE-2026-27707?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Seerr

CVE-2026-27707

Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Starting in version 2.0.0 and prior to version 3.1.0, an authentication guard logic flaw in `POST /api/v1/auth/jellyfin` allows an unauthenticated at…

EPSS: 0.005 (40.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Seerr
Seerr-team Seerr — versions >= 2.0.0, < 3.1.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-27707?: CVE-2026-27707 is a high-severity vulnerability in Seerr, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.3/10. Published 2026-02-27.
How severe is CVE-2026-27707?: High severity. CVSS v3 base score is 7.3 out of 10.