CVE-2026-4881

published 2026-06-04

CVE-2026-4881: In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make server level changes…

Priority P3 35 medium 6.5 CVSS 3.1

AV N AC L PR L UI N S U C N I N A H

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.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
octopus	octopus_server	>= 2023.1.4189 < 2025.4.10545	2025.4.10545
octopus	octopus_server	>= 2026.1.675 < 2026.1.11313	2026.1.11313
octopus_deploy	octopus_server	>= 2023.0.0 < 2025.4.10523	2025.4.10523
octopus_deploy	octopus_server	>= 2025.4.0 < 2025.4.10545	2025.4.10545
octopus_deploy	octopus_server	>= 2026.1.0 < 2026.1.11313	2026.1.11313

CVSS provenance

nvd v3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 6.0 MEDIUM 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/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

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-862