CVE-2026-116870
High
Description
In affected versions of Octopus Server, OIDC token issuer validation was performed inconsistently. This could result in a token issued from a suitably configured non legitimate issuer being accepted as a token belonging to a service account from a legitimate trusted issuer. Exploitation requires a service account with at least one OIDC identity configured. An attacker would also need to know or guess some details of that identity in order to be in a position to attempt exploitation.
SeverityHigh
CVSS8.7
Exploit probability—
ProductOctopus Server
PublishedOct 27, 2026
First seenOct 27, 2026
Weakness typeCWE-1289CWE-1289
How to fix
Update
- Octopus Deploy Octopus Server2026.1.11781, 2026.2.13438, 2026.3.15816 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Octopus Deploy Octopus Server | 2024.1.0 ≤ v < 2026.1.11781, 2026.2.0 ≤ v < 2026.2.13438, 2026.3.0 ≤ v < 2026.3.15816 | 2026.1.11781, 2026.2.13438, 2026.3.15816 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.