What is CVE-2026-5557?

CVE-2026-5557 is a medium-severity vulnerability in Badlogic Pi-Mono, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-04-05.

How severe is CVE-2026-5557?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Auth bypass in Badlogic Pi-Mono

CVE-2026-5557

A vulnerability was detected in badlogic pi-mono up to 0.58.4. This issue affects some unknown processing of the file packages/mom/src/slack.ts of the component pi-mom Slack Bot. The manipulation results in authentication bypass using alternate channel. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Vulnerability class: Broken Authentication

Published 2026-04-05 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.005 (40.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Badlogic Pi-Mono — versions 0.58.0, 0.58.1, 0.58.2

Weakness classification (CWE)

References

vuldb.com/vuln/355327 (vdb-entry)
vuldb.com/vuln/355327/cti (signature, permissions-required)
vuldb.com/submit/782879 (third-party-advisory)
github.com/August829/CVEP/issues/28 (issue-tracking, exploit)

Frequently asked questions

What is CVE-2026-5557?: CVE-2026-5557 is a medium-severity vulnerability in Badlogic Pi-Mono, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-04-05.
How severe is CVE-2026-5557?: Medium severity. CVSS v3 base score is 6.3 out of 10.