Description
Bastillion fails to properly validate request URI paths in its controller dispatcher, allowing unauthenticated attackers to bypass authentication filters by prefixing requests with arbitrary path segments. Attackers can access administrative controllers to read user listings, create manager accounts, and register managed systems, gaining control over SSH access to the managed fleet.
References6
- github.com/bastillion-io/Bastillion
- github.com/bastillion-io/Bastillion/blob/master/src/main/java/l…
- github.com/bastillion-io/Bastillion/commit/d759fb686a1a097b1b02…
- github.com/bastillion-io/Bastillion/issues/669
- www.vulncheck.com/advisories/bastillion-authentication-bypass-v…
- github.com/bastillion-io/Bastillion/issues/669
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 58 · as of 11 November 2026
- CWE
- CWE-288
Could this be exploited in your environment?
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