What is CVE-2026-1063?

CVE-2026-1063 is a medium-severity vulnerability in Bastillion-Io Bastillion, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-01-17.

How severe is CVE-2026-1063?

Medium severity. CVSS v3 base score is 4.7 out of 10.

RCE in Bastillion-Io Bastillion

CVE-2026-1063

A vulnerability has been found in bastillion-io Bastillion up to 4.0.1. This vulnerability affects unknown code of the file src/main/java/io/bastillion/manage/control/AuthKeysKtrl.java of the component Public Key Management System. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Published 2026-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.046 (91.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.046 · change: +0.003

Affected products

Bastillion-Io Bastillion — versions 4.0.0, 4.0.1

Weakness classification (CWE)

References

vuldb.com/ (technical-description, vdb-entry)
vuldb.com/ (signature, permissions-required)
vuldb.com/ (third-party-advisory)
github.com/AnalogyC0de/public_exp/blob/main/archives/Bastillion/report1.md (exploit)

Frequently asked questions

What is CVE-2026-1063?: CVE-2026-1063 is a medium-severity vulnerability in Bastillion-Io Bastillion, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-01-17.
How severe is CVE-2026-1063?: Medium severity. CVSS v3 base score is 4.7 out of 10.