CVE-2023-50266: Bazarr manages and downloads subtitles

Routine

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2023-50266 is a medium-severity flaw (CVSS 5.3) affecting bazarr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-918
Published	2023-12-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bazarr

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-15 21:15 UTCPublished CVE record published
2026-06-17 06:39 UTCUpdated Record last modified

bazarr bazarr DOWNGRADE

Affected: 1.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.4

1. Check installed version

apt-cache policy bazarr || rpm -q bazarr || bazarr --version

2. No fixed release: DOWNGRADE to a release before 1.2.4 (Debian / Ubuntu)

apt-cache madison bazarr sudo apt install bazarr=<VERSION_BEFORE_1.2.4> sudo apt-mark hold bazarr

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bazarr sudo dnf downgrade bazarr-<VERSION_BEFORE_1.2.4> sudo dnf versionlock add bazarr

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-50266?

bazarr: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-50266 being exploited?

CVE-2023-50266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-50266 affect?

CVE-2023-50266 affects bazarr. Severity is medium (CVSS 5.3). 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 t

How urgent is CVE-2023-50266?

Priority 36/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-40348 HIGH 8.2 UPGRADE An issue in the component /api/swaggerui/static of Bazaar v1.4.3 allows unauthenticated attackers to execute a
CVE-2023-50265 HIGH 7.5 UPGRADE Bazarr manages and downloads subtitles
CVE-2023-50264 HIGH 7.5 UPGRADE Bazarr manages and downloads subtitles

References

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