CVE-2026-55883Network attack vector

HUD stream disclosure via unauthenticated WebSocket token

Published Jul 10, 2026 · Updated Jul 10, 2026

Cross-site WebSocket hijacking in Tilt 0.24.0 through 0.37.3 allows remote attackers to read HUD session state over the network. The /api/websocket_token handler returns the process-wide CSRF token without authentication, while /ws/view also accepts clients that omit Origin. Exploitation requires a non-loopback HUD bind and listener reachability; it discloses Tiltfile contents, resource statuses, session state, and updates.

CVSS severity8.3
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site WebSocket hijacking in Tilt 0.24.0 through 0.37.3 allows remote attackers to read HUD session state over the network. The /api/websocket_token handler returns the process-wide CSRF token without authentication, while /ws/view also accepts clients that omit Origin. Exploitation requires a non-loopback HUD bind and listener reachability; it discloses Tiltfile contents, resource statuses, session state, and updates.

The record

CVE
CVE-2026-55883
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Tilt Dev
Product
Tilt
Classifications
CWE-345, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 0.24.0, < 0.37.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tilt Dev · Tiltversion=>= 0.24.0, < 0.37.4

Published CVSS scores

8.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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