CVE-2026-4881 PUBLISHED

Assigner: Octopus
Reserved: 26.03.2026 Published: 04.06.2026 Updated: 04.06.2026

In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make server level changes using a certain API endpoint despite receiving an error.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Octopus Deploy
Product	Octopus Server
Versions	Default: unaffected affected from 2023.0.0 to 2025.4.10523 (excl.) affected from 2025.4.0 to 2025.4.10545 (excl.) affected from 2026.1.0 to 2026.1.11313 (excl.)

Credits

This vulnerability was found by MononcleMich finder

References

https://advisories.octopus.com/post/2026/sa2026-04

Problem Types

Insufficient permission checks on an API endpoint