Unauthenticated tool execution via unset signing secret
Published Apr 20, 2026 · Updated Apr 20, 2026
Improper authentication in Rowboat 0.1.67 and earlier allows remote attackers to invoke configured tools through the tool_call webhook. The require_signed_request decorator skips signature validation when SIGNING_SECRET is empty, then tool_call parses attacker-controlled function names and arguments before dispatching them through call_tool. Exploitation requires a reachable tools_webhook service with an unset signing secret; consequences are limited to FUNCTIONS_MAP entries and the worker's privileges.
Summary
What happened
Improper authentication in Rowboat 0.1.67 and earlier allows remote attackers to invoke configured tools through the tool_call webhook. The require_signed_request decorator skips signature validation when SIGNING_SECRET is empty, then tool_call parses attacker-controlled function names and arguments before dispatching them through call_tool. Exploitation requires a reachable tools_webhook service with an unset signing secret; consequences are limited to FUNCTIONS_MAP entries and the worker's privileges.
The record
- CVE
- CVE-2026-6635
- Published
- Apr 20, 2026
- Updated
- Apr 20, 2026
- Vendor
- Rowboat Labs
- Product
- Rowboat
- Classifications
- CWE-287, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 20, 2026CVE publishedPublication date reported by the CVE source.
- Apr 20, 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.
- Affected versionversion=0.1.0
- Affected versionversion=0.1.1
- Affected versionversion=0.1.10
- Affected versionversion=0.1.11
- Affected versionversion=0.1.12
- Affected versionversion=0.1.13
- Affected versionversion=0.1.14
- Affected versionversion=0.1.15
- Affected versionversion=0.1.16
- Affected versionversion=0.1.17
- Affected versionversion=0.1.18
- Affected versionversion=0.1.19
- Affected versionversion=0.1.2
- Affected versionversion=0.1.20
- Affected versionversion=0.1.21
- Affected versionversion=0.1.22
- Affected versionversion=0.1.23
- Affected versionversion=0.1.24
- Affected versionversion=0.1.25
- Affected versionversion=0.1.26
- Affected versionversion=0.1.27
- Affected versionversion=0.1.28
- Affected versionversion=0.1.29
- Affected versionversion=0.1.3
- Affected versionversion=0.1.30
- Affected versionversion=0.1.31
- Affected versionversion=0.1.32
- Affected versionversion=0.1.33
- Affected versionversion=0.1.34
- Affected versionversion=0.1.35
- Affected versionversion=0.1.36
- Affected versionversion=0.1.37
- Affected versionversion=0.1.38
- Affected versionversion=0.1.39
- Affected versionversion=0.1.4
- Affected versionversion=0.1.40
- Affected versionversion=0.1.41
- Affected versionversion=0.1.42
- Affected versionversion=0.1.43
- Affected versionversion=0.1.44
- Affected versionversion=0.1.45
- Affected versionversion=0.1.46
- Affected versionversion=0.1.47
- Affected versionversion=0.1.48
- Affected versionversion=0.1.49
- Affected versionversion=0.1.5
- Affected versionversion=0.1.50
- Affected versionversion=0.1.51
- Affected versionversion=0.1.52
- Affected versionversion=0.1.53
- Affected versionversion=0.1.54
- Affected versionversion=0.1.55
- Affected versionversion=0.1.56
- Affected versionversion=0.1.57
- Affected versionversion=0.1.58
- Affected versionversion=0.1.59
- Affected versionversion=0.1.6
- Affected versionversion=0.1.60
- Affected versionversion=0.1.61
- Affected versionversion=0.1.62
- Affected versionversion=0.1.63
- Affected versionversion=0.1.64
- Affected versionversion=0.1.65
- Affected versionversion=0.1.66
- Affected versionversion=0.1.67
- Affected versionversion=0.1.7
- Affected versionversion=0.1.8
- Affected versionversion=0.1.9
What conditions does exploitation require?
What is affected?
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.
Public exploit references
- Rowboat Labs Rowboat 0.1.67 Authentication Bypass Issuesproof of concept · unverified
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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