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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 attacker to register a new Seerr account on any Plex-configured instance by authenticating with an attacker-controlled Jellyfin server. The attacker receives an authenticated session and can immediately use the application with default permissions, including the
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bcee1d9a65f76ddf35f3cfd7b7fc6d6ab1412839c5cb492580aa7a139fc98f8d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-807","description":"CWE-807: Reliance on Untrusted Inputs in a Security Decision","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-288","description":"CWE-288: Authentication Bypass Using an Alternate Path or Channel","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"seerr","vendor":"seerr-team","versions":[{"status":"affected","version":">= 2.0.0, < 3.1.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-807","description":"CWE-807: Reliance on Untrusted Inputs in a Security Decision","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-288","description":"CWE-288: Authentication Bypass Using an Alternate Path or Channel","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e","tags":["x_refsource_MISC"],"url":"https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/references/1
{"name":"https://github.com/seerr-team/seerr/releases/tag/v3.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/seerr-team/seerr/releases/tag/v3.1.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/references/2
{"name":"https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:70a4c1cef56522544e1ed433000452ac396ba95ff39225c2d7c6d03a54581faf · sha256:eefe8e81a1d1a003… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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