CVE-2026-67426Public exploitNetwork attack vector

Secret exfiltration via unauthenticated callback URL SSRF

Published Jul 29, 2026 · Updated Jul 29, 2026

SSRF in Flyto2 Core before 2.26.7 allows remote attackers to exfiltrate the runner secret through an unauthenticated callback. The /run handler accepts callback_url verbatim, skips target_allowed and URL validation, then posts with X-Internal-Key attached. Exposure requires the standalone verification service to be reachable; a stolen secret authenticates forged callbacks to the engine.

CVSS severity9.3
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Flyto2 Core before 2.26.7 allows remote attackers to exfiltrate the runner secret through an unauthenticated callback. The /run handler accepts callback_url verbatim, skips target_allowed and URL validation, then posts with X-Internal-Key attached. Exposure requires the standalone verification service to be reachable; a stolen secret authenticates forged callbacks to the engine.

The record

CVE
CVE-2026-67426
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Flyto2
Product
Flyto2 Core
Classifications
CWE-306, CWE-918, CWE-522, T1552.005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=< 2.26.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Flyto2 · Flyto2 Coreversion=< 2.26.7

Published CVSS scores

9.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-918Server-Side Request Forgery (SSRF)
CWE-522Insufficiently Protected Credentials
T1552.005Cloud Instance Metadata API
T1190Exploit Public-Facing Application

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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