CVE-2026-35628
Received Received - Intake
Missing Rate Limiting in OpenClaw Telegram Webhook Enables Brute-Force

Publication date: 2026-04-09

Last updated on: 2026-04-15

Assigner: VulnCheck

Description
OpenClaw before 2026.3.25 contains a missing rate limiting vulnerability in Telegram webhook authentication that allows attackers to brute-force weak webhook secrets. The vulnerability enables repeated authentication guesses without throttling, permitting attackers to systematically guess webhook secrets through brute-force attacks.
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Meta Information
Published
2026-04-09
Last Modified
2026-04-15
Generated
2026-06-16
AI Q&A
2026-04-10
EPSS Evaluated
2026-06-15
NVD
CVE-2026-35628
EUVD
EUVD-2026-21114
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.3.25 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-307 The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.
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Executive Summary

This vulnerability exists in OpenClaw versions before 2026.3.25 and involves a missing rate limiting mechanism in the Telegram webhook authentication process.

Because there is no throttling on authentication attempts, attackers can repeatedly try to guess weak webhook secrets through brute-force attacks.

This allows attackers to systematically attempt many authentication guesses without restriction, increasing the likelihood of successfully compromising the webhook secret.

Impact Analysis

The vulnerability can lead to unauthorized access to the Telegram webhook by allowing attackers to brute-force weak webhook secrets.

Successful exploitation could compromise the integrity and confidentiality of communications or data handled through the webhook.

Since the vulnerability has a CVSS v3.1 base score of 4.8 (medium severity) and v4.0 base score of 6.3 (medium severity), it represents a moderate risk that could impact system security.

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