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Vulnerability Details :

CVE-2026-27707

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-27 Feb, 2026 | 19:29
Updated At-27 Feb, 2026 | 20:22
Rejected At-
Credits

Plex-configured Seerr instances vulnerable to unauthenticated account registration via Jellyfin authentication endpoint

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 ability to submit media requests to Radarr/Sonarr. Any Seerr deployment where all three of the following are true may be vulnerable: `settings.main.mediaServerType` is set to `PLEX` (the most common deployment).; `settings.jellyfin.ip` is set to `""` (default, meaning Jellyfin was never configured); and `settings.main.newPlexLogin` is set to `true` (default). Jellyfin-configured and Emby-configured deployments are not affected. Version 3.1.0 of Seerr fixes this issue.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:27 Feb, 2026 | 19:29
Updated At:27 Feb, 2026 | 20:22
Rejected At:
▼CVE Numbering Authority (CNA)
Plex-configured Seerr instances vulnerable to unauthenticated account registration via Jellyfin authentication endpoint

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 ability to submit media requests to Radarr/Sonarr. Any Seerr deployment where all three of the following are true may be vulnerable: `settings.main.mediaServerType` is set to `PLEX` (the most common deployment).; `settings.jellyfin.ip` is set to `""` (default, meaning Jellyfin was never configured); and `settings.main.newPlexLogin` is set to `true` (default). Jellyfin-configured and Emby-configured deployments are not affected. Version 3.1.0 of Seerr fixes this issue.

Affected Products
Vendor
seerr-team
Product
seerr
Versions
Affected
  • >= 2.0.0, < 3.1.0
Problem Types
TypeCWE IDDescription
CWECWE-288CWE-288: Authentication Bypass Using an Alternate Path or Channel
CWECWE-807CWE-807: Reliance on Untrusted Inputs in a Security Decision
Type: CWE
CWE ID: CWE-288
Description: CWE-288: Authentication Bypass Using an Alternate Path or Channel
Type: CWE
CWE ID: CWE-807
Description: CWE-807: Reliance on Untrusted Inputs in a Security Decision
Metrics
VersionBase scoreBase severityVector
3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7
x_refsource_CONFIRM
https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e
x_refsource_MISC
https://github.com/seerr-team/seerr/releases/tag/v3.1.0
x_refsource_MISC
Hyperlink: https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e
Resource:
x_refsource_MISC
Hyperlink: https://github.com/seerr-team/seerr/releases/tag/v3.1.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:27 Feb, 2026 | 20:21
Updated At:27 Feb, 2026 | 20:21

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 ability to submit media requests to Radarr/Sonarr. Any Seerr deployment where all three of the following are true may be vulnerable: `settings.main.mediaServerType` is set to `PLEX` (the most common deployment).; `settings.jellyfin.ip` is set to `""` (default, meaning Jellyfin was never configured); and `settings.main.newPlexLogin` is set to `true` (default). Jellyfin-configured and Emby-configured deployments are not affected. Version 3.1.0 of Seerr fixes this issue.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Type: Secondary
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-288Primarysecurity-advisories@github.com
CWE-807Primarysecurity-advisories@github.com
CWE ID: CWE-288
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-807
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8esecurity-advisories@github.com
N/A
https://github.com/seerr-team/seerr/releases/tag/v3.1.0security-advisories@github.com
N/A
https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7security-advisories@github.com
N/A
Hyperlink: https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/seerr-team/seerr/releases/tag/v3.1.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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