CVE-2023-50266: Bazarr Blind Server-Side Request Forgery (SSRF) in the /test/<protocol>/ endpoint

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-15 · updated 2026-06-17
Weakness: CWE-918

Description

Bazarr manages and downloads subtitles. In version 1.2.4, the proxy method in bazarr/bazarr/app/ui.py does not validate the user-controlled protocol and url variables and passes them to requests.get() without any sanitization, which leads to a blind server-side request forgery (SSRF). This issue allows for crafting GET requests to internal and external resources on behalf of the server. 1.3.1 contains a partial fix, which limits the vulnerability to HTTP/HTTPS protocols.

Affected products

morpheus65535 bazarr: 1.2.4

References

https://github.com/morpheus65535/bazarr/commit/17add7fbb3ae1919a40d505470d499d46df9ae6b
https://github.com/morpheus65535/bazarr/releases/tag/v1.3.1
https://securitylab.github.com/advisories/GHSL-2023-192_GHSL-2023-194_bazarr/
https://github.com/morpheus65535/bazarr/commit/17add7fbb3ae1919a40d505470d499d46df9ae6b
https://github.com/morpheus65535/bazarr/releases/tag/v1.3.1
https://securitylab.github.com/advisories/GHSL-2023-192_GHSL-2023-194_bazarr/

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