CVE-2026-54635Public exploitNetwork attack vector

Unauthenticated handler invocation via custom-path token omission

Published Jul 28, 2026 · Updated Jul 28, 2026

Authentication bypass in Shon Ness pytonapi 2.0.0 through 2.2.0 allows remote attackers to invoke webhook handlers with forged payloads. TonapiWebhookDispatcher.setup() records bearer tokens only for default suffix paths, so process() finds no expected token for a custom path and skips its authentication guard. Exposure requires an application to register a handler with the documented path argument; forged events then reach victim-defined business logic.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Shon Ness pytonapi 2.0.0 through 2.2.0 allows remote attackers to invoke webhook handlers with forged payloads. TonapiWebhookDispatcher.setup() records bearer tokens only for default suffix paths, so process() finds no expected token for a custom path and skips its authentication guard. Exposure requires an application to register a handler with the documented path argument; forged events then reach victim-defined business logic.

The record

CVE
CVE-2026-54635
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Shon Ness
Product
pytonapi
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=>= 2.0.0, < 2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shon Ness · pytonapiversion=>= 2.0.0, < 2.2.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-287Improper Authentication
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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