Label Studio through 1.23.0 fails to validate webhook URLs, allowing authenticated users to dispatch requests to internal services including RFC 1918 addresses and cloud metadata endpoints. Attackers can create webhooks targeting private networks and exfiltrate annotation data by enabling payload transmission in outbound requests.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
HumanSignal label-studio unaffected
Version Status Constraints
0 affected ≤ 1.23.0

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Humansignal Subscribe
Label Studio Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/HumanSignal/label-studio cve-icon cve-icon
https://github.com/HumanSignal/label-studio/blob/1.23.0/label_studio/webhooks/utils.py cve-icon cve-icon
https://github.com/HumanSignal/label-studio/commit/2c1c1d6472153032af8ed399168f814bea854e3e cve-icon cve-icon
https://github.com/HumanSignal/label-studio/issues/9801 cve-icon cve-icon
https://www.vulncheck.com/advisories/label-studio-through-1.23.0-ssrf-via-unvalidated-webhook-url cve-icon cve-icon
History

Thu, 03 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Description Label Studio through 1.23.0 fails to validate webhook URLs, allowing authenticated users to dispatch requests to internal services including RFC 1918 addresses and cloud metadata endpoints. Attackers can create webhooks targeting private networks and exfiltrate annotation data by enabling payload transmission in outbound requests.
Title Label Studio through 1.23.0 SSRF via Unvalidated Webhook URL
First Time appeared Humansignal
Humansignal label Studio
Weaknesses CWE-918
CPEs cpe:2.3:a:humansignal:label_studio:*:*:*:*:*:*:*:*
Vendors & Products Humansignal
Humansignal label Studio
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N'}

cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-03T14:12:18.328Z

Reserved: 2026-09-03T11:08:17.526Z

Link: CVE-2026-85179

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-03T15:17:39.097

Modified: 2026-09-03T15:17:39.097

Link: CVE-2026-85179

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses