vulnerability / NVI-00016151 / Revision 1
PraisonAI LinearBot processes unsigned webhooks when LINEAR_WEBHOOK_SECRET is missing
GitHub lists this reviewed advisory for praisonai. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
8.6 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
praisonai
source listed>= 4.6.56, <= 4.6.58
# PraisonAI LinearBot processes unsigned webhooks when `LINEAR_WEBHOOK_SECRET` is missing ## Summary PraisonAI's LinearBot starts a public webhook listener on `0.0.0.0` and treats `LINEAR_WEBHOOK_SECRET` as optional. When the secret is absent, startup only logs a warning and `_handle_webhook()` skips `Linear-Signature` verification entirely. An unauthenticated network caller who can reach the webhook endpoint can submit a forged `Linear-Event: AgentSession` request. The forged request is parsed, scheduled for background processing, dispatched to `_handle_agent_session()`, and passed into `BotSessionManager.chat()`. The bot then attempts to post the agent response back to Linear under the configured bot token. The local PoV is offline and deterministic. It does not contact Linear. It calls the webhook handler directly, monkey-patches the outbound Linear comment path, and proves both sides of the boundary: - no secret configured: unsigned forged webhook returns `200`, invokes the agent session path once, and attempts one Linear comment; - secret configured: missing and bad signatures both return `401` and do not invoke the agent; - secret configured with valid HMAC: request
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
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04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-fc26-m9pf-v56q ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.