CVE-2026-22033Public exploitNetwork attack vector

Authenticated account takeover via unescaped custom hotkeys

Published Jan 12, 2026 · Updated Jan 12, 2026

Stored XSS in HumanSignal Label Studio 1.22.0 and earlier allows remote authenticated users to take over accounts via custom hotkeys. The base.html template marks JSON-serialized user.custom_hotkeys as safe without escaping closing script tags, letting stored markup break out of the inline script. A low-privileged account can persist the payload through the user API; a victim who loads an affected page executes it, exposing the victim's API token and API access.

CVSS severity8.6
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in HumanSignal Label Studio 1.22.0 and earlier allows remote authenticated users to take over accounts via custom hotkeys. The base.html template marks JSON-serialized user.custom_hotkeys as safe without escaping closing script tags, letting stored markup break out of the inline script. A low-privileged account can persist the payload through the user API; a victim who loads an affected page executes it, exposing the victim's API token and API access.

The record

CVE
CVE-2026-22033
Published
Jan 12, 2026
Updated
Jan 12, 2026
Vendor
HumanSignal
Product
Label Studio
Classifications
CWE-284, CWE-79, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HumanSignal · Label Studioversion=<= 1.22.0

Published CVSS scores

8.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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