Log in Start free

Vulnerability · Published Jul 28, 2026 · Assigned by GitHub_M

CVE-2026-54635pytonapi has a Webhook Custom Path Authentication Bypass

High 7.5

In plain English

A high-severity improper authentication in tonapi from nessshon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 56.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

pytonapi is a Python SDK for TONAPI that provides REST API, streaming, and webhook access to the TON blockchain. From 2.0.0 to 2.2.0, TonapiWebhookDispatcher fails to validate the Authorization header when a webhook handler is registered with the documented path argument, because setup() stores bearer tokens only under the default suffix paths and never adds the custom path to the token map, so self._tokens.get(path) returns None and the authentication guard is skipped. An unauthenticated remote attacker can POST forged payloads to the custom webhook endpoint and trigger victim-defined handlers. This issue is fixed in version 2.2.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIpytonapi2.2.1GHSA-3fcr-jvgp-7f58
PyPIpytonapi2.2.1PYSEC-2026-3614

Affected products (as reported)

VendorProductVersions
nessshon tonapi >= 2.0.0, < 2.2.1

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References