# CVE-2026-116870: Octopus Server OIDC token issuer validation bypass

Source: https://junglewise.ai/threats/cve-2026-116870-in-affected-versions-of-octopus-server-oidc-token-issuer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-116870 · Severity: info · Published 2026-10-27

Octopus Server is deployment automation software used to manage application releases across infrastructure. A flaw in how it validates OIDC (OpenID Connect) tokens allows an attacker to forge tokens that impersonate service accounts, potentially gaining unauthorized deployment capabilities. Successful exploitation requires the attacker to have detailed knowledge of a legitimate service account's OIDC identity and to control a non-legitimate issuer.

Technologies: [Octopus Deploy Octopus Server](https://junglewise.ai/threats/technologies/octopus-server). Vendors: [Octopus Deploy](https://junglewise.ai/threats/vendors/octopus-deploy).

## Quick answers

**Is CVE-2026-116870 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116870 being exploited in the wild.

**How severe is CVE-2026-116870?** Informational severity, published 27 October 2026.

**Which products and versions are affected?** Octopus Deploy Octopus Server 2024.1.11866 through 2024.x, all 2025.x, 2026.1.x before 2026.1.11781, 2026.2.x before 2026.2.13438, 2026.3.x before 2026.3.15816.

**Is there a fix for CVE-2026-116870?** Yes: fixed in Octopus Server 2026.1.11781, 2026.2.13438, 2026.3.15816. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116870 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-116870?** Check whether you run Octopus Deploy Octopus Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Octopus Server 2026.1.11781, 2026.2.13438, 2026.3.15816

## Technical details

The vulnerability stems from inconsistent OIDC token issuer validation in Octopus Server, allowing a token from an attacker-controlled issuer to be accepted as originating from a legitimate trusted issuer. An attacker must know or guess details of an existing service account's OIDC identity configuration to exploit this. The flaw enables token forgery and service account impersonation when OIDC identities are configured on service accounts.

## Affected products

- Octopus Deploy Octopus Server 2024.1.11866 through 2024.x, all 2025.x, 2026.1.x before 2026.1.11781, 2026.2.x before 2026.2.13438, 2026.3.x before 2026.3.15816

## Timeline

- 2026-09-09: disclosed: Discovery date
- 2026-09-14: patched: Patch release date
- 2026-10-27: advisory: Public advisory release

## References

- [https://advisories.octopus.com/post/2026/sa2026-15](https://advisories.octopus.com/post/2026/sa2026-15)

## Related threats

- [Octopus Server authorization bypass in LDAP identity editing](https://junglewise.ai/threats/cve-2026-124628-in-affected-versions-of-octopus-server-incorrect-validation-of)
- [Octopus Server LDAP identity injection leading to privilege escalation](https://junglewise.ai/threats/cve-2026-124627-in-affected-versions-of-octopus-server-incorrect-validation-of)
- [Octopus Server OIDC claim validation bypass](https://junglewise.ai/threats/cve-2026-116835-in-affected-versions-of-octopus-server-insufficient-validation)
- [Octopus Server incorrect authorization in project triggers](https://junglewise.ai/threats/cve-2026-93487-in-affected-versions-of-octopus-server-incorrect-validation-of)
- [Octopus Server privilege escalation in LDAP login editing](https://junglewise.ai/threats/cve-2026-105948-in-affected-versions-of-octopus-server-incorrect-validation-of)