badlogic pi-mono pi-mom Slack Bot slack.ts Authentifizierungsumgehung

The core impact of CVE-2026-5557 lies in the ability to bypass authentication within the pi-mono Slack Bot. An attacker exploiting this vulnerability could gain unauthorized access to sensitive information or perform actions on behalf of the bot without proper credentials. This could include accessing Slack channels, sending messages, or potentially integrating with other systems the bot interacts with. Given the public availability of a proof-of-concept, the risk of exploitation is elevated, potentially leading to data breaches, unauthorized system access, and reputational damage. The attack vector is remote, meaning an attacker doesn't need local access to the system running pi-mono.

Organizations using pi-mono in their Slack bot integrations, particularly those relying on the default authentication mechanisms, are at significant risk. Shared hosting environments where multiple users share the same pi-mono instance are also particularly vulnerable, as an attacker could potentially compromise the bot and gain access to other users' data.

• nodejs: Monitor process execution for suspicious activity related to slack.ts.

Get-Process -Name 'pi-mono' | Select-Object -ExpandProperty Path

• nodejs: Check for unauthorized modifications to the packages/mom/src/slack.ts file using file integrity monitoring tools. • generic web: Monitor access logs for requests targeting the vulnerable endpoint.

grep 'slack.ts' /var/log/nginx/access.log

1. 2026-04-05Disclosure

   disclosure

1. Reserviert2026-04-04
2. Veröffentlicht2026-04-05
3. Geändert2026-04-06
4. EPSS aktualisiert2026-04-12

The primary mitigation for CVE-2026-5557 is to upgrade to a patched version of pi-mono as soon as it becomes available. Until a patch is released, restrict access to the vulnerable endpoint (packages/mom/src/slack.ts) using network firewalls or access control lists. Implement strict input validation on any data processed by the Slack bot to prevent malicious manipulation. Consider temporarily disabling the Slack bot integration if upgrading or implementing access controls is not immediately feasible. Monitor Slack channel activity for suspicious behavior. After applying any mitigation, verify its effectiveness by attempting to trigger the authentication bypass manually.