Untrusted search path in Octopus Server
Priority LOW 34CWE-426Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-426.
Summary
When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.
Why it matters now
EPSS 0.00263 18th percentileScored 2026-11-07
Fix Fixed Octopus Server (Octopus Deploy): 2020.4.229, 2020.5.256
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Octopus Deploy | Octopus Server | 0.9 and later; before 2020.4.229; 2020.5.0 and later; before 2020.5.256 | 2020.4.229, 2020.5.256 | Patch available | CNA |
- Octopus Server VendorOctopus Deploy Affected 0.9 and later; before 2020.4.229; 2020.5.0 and later; before 2020.5.256 Fixed in 2020.4.229, 2020.5.256 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:octopus:octopus_deploy:*:*:*:*:*:*:*:* | 0.9 to before 2020.4.229 | Vulnerable | Octopus Deploy |
| cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:* | 2020.5.0 to before 2020.5.256 | Vulnerable | Octopus Deploy |
- cpe:2.3:a:octopus:octopus_deploy:*:*:*:*:*:*:*:* Versions 0.9 to before 2020.4.229 Vulnerable ·Octopus Deploy
- cpe:2.3:a:octopus:octopus_server:*:*:*:*:*:*:*:* Versions 2020.5.0 to before 2020.5.256 Vulnerable ·Octopus Deploy
Remediation
- Fix · CNA Octopus Server (Octopus Deploy) Fixed in 2020.4.229, 2020.5.256
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26556
- 2026-10-03 Alias added: GHSA-cpf5-2wrr-hcvc
References
More Octopus Deploy vulnerabilities
- TI-2020-08583 In Octopus Deploy before 2020.1.5, for customers running on-premises Active Directory… CVSS 3.1HIGH 8.8
- TI-2018-04116 An issue was discovered in Octopus Deploy before 4.1.9. CVSS 3.0HIGH 8.8
- TI-2018-03438 In Octopus Deploy versions 3.2.11 - 4.1.5 (fixed in 4.1.6), an authenticated user with… CVSS 3.0HIGH 8.8
- TI-2017-12930 In Octopus Deploy before 4.1.3, the machine update process doesn't check that the user… CVSS 3.0HIGH 8.8
- TI-2019-08703 In Octopus Deploy 2019.1.0 through 2019.3.1 and 2019.4.0 through 2019.4.5, an… CVSS 3.0HIGH 8.1
- TI-2020-15818 In Octopus Deploy 3.1.0 to 2020.4.0, certain scripts can reveal sensitive information to the user in the task logs. CVSS 3.1HIGH 7.5
Sources
- CVE-2021-26556 · CVE Program
- CVE-2021-26556 · NVD
- FIRST EPSS
- GHSA-cpf5-2wrr-hcvc · GitHub Advisory Database · CC BY 4.0
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