What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-28 · updated 2026-10-23
• Weakness: CWE-287

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 products

• nessshon tonapi: from 2.0.0, < 2.2.1

References

• https://github.com/nessshon/tonapi/commit/854222b7ee68d3fb7b4d6d899d200f388483bd86
• https://github.com/nessshon/tonapi/releases/tag/v2.2.1
• https://github.com/nessshon/tonapi/security/advisories/GHSA-3fcr-jvgp-7f58
• https://github.com/pypa/advisory-database/tree/main/vulns/pytonapi/PYSEC-2026-3614.yaml
• https://github.com/nessshon/tonapi/security/advisories/GHSA-3fcr-jvgp-7f58

Get alerted when CVE-2026-54635 or the next vulnerability affects your stack