CVE-2026-54635 | pytonapi is a Python SDK for TONAPI that provides REST API, … | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-54635
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-15 20:07 UTC
Published: 2026-07-28 17:09 UTC
Last updated: 2026-07-28 17:31 UTC
Primary CWE: CWE-287
CWE-287: Improper Authentication
Vendor / Product: nessshon / tonapi
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
nessshon	tonapi	—	>= 2.0.0, < 2.2.1

Weakness (CWE)

CWE	Source	Description
CWE-287	cna	CWE-287: Improper Authentication

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References (4)

https://github.com/nessshon/tonapi/security/advisories/GHSA-3fcr-jvgp-7f58 https://github.com/nessshon/tonapi/security/advisories/GHSA-3fcr-jvgp-7f58
https://github.com/nessshon/tonapi/commit/854222b7ee68d3fb7b4d6d899d200f388483bd86 https://github.com/nessshon/tonapi/commit/854222b7ee68d3fb7b4d6d899d200f388483bd86
https://github.com/nessshon/tonapi/releases/tag/v2.2.1 https://github.com/nessshon/tonapi/releases/tag/v2.2.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N