# CVE-2026-116835: Octopus Server OIDC claim validation bypass

Source: https://junglewise.ai/threats/cve-2026-116835-in-affected-versions-of-octopus-server-insufficient-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-116835 · Severity: info · Published 2026-11-12

Octopus Server is a deployment automation platform that manages application releases and integrations with cloud providers. An authenticated user with account edit permissions can manipulate OIDC authentication tokens to impersonate other projects, potentially gaining unauthorized access to external systems like cloud platforms or other Octopus instances that trust those project identities.

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-2026-116835 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116835 being exploited in the wild.

**How severe is CVE-2026-116835?** Informational severity, published 12 November 2026.

**Which products and versions are affected?** Octopus Deploy Octopus Server 2025.3.x after 2025.3.11571, 2025.4.x, 2026.1.x, 2026.2.x before 2026.2.13503, 2026.3.x before 2026.3.15894.

**Is there a fix for CVE-2026-116835?** Yes: fixed in Octopus Server 2026.2.13503, 2026.3.15894. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116835 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-116835?** 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 2026.2.13503, 2026.3.15894

## Technical details

The vulnerability stems from insufficient validation of custom claims in OIDC accounts. An attacker with permission to edit accounts can craft signed OIDC tokens with spoofed subject and project claims, enabling cross-project impersonation. This requires authenticated access to account management functions but allows arbitrary project identity assumption.

## Affected products

- Octopus Deploy Octopus Server 2025.3.x after 2025.3.11571, 2025.4.x, 2026.1.x, 2026.2.x before 2026.2.13503, 2026.3.x before 2026.3.15894

## Timeline

- 2026-10-06: disclosed
- 2026-10-08: patched
- 2026-11-12: advisory

## References

- [https://advisories.octopus.com/post/2026/sa2026-22](https://advisories.octopus.com/post/2026/sa2026-22)

## 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 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)
- [Octopus Server authentication cookie forgery leading to privilege escalation](https://junglewise.ai/threats/cve-2026-96414-in-affected-versions-of-octopus-server-insufficient-integrity)