Security readout for executives and security teams
Plain-English summary
CVE-2026-22601 affects OpenProject 16.6.1 and earlier. A logged-in administrator could abuse the email configuration test feature to run operating-system commands on the server. This is high impact because successful abuse can compromise the OpenProject host, but it requires administrator privileges.
Executive priority
Prioritize remediation for internet-facing or business-critical OpenProject deployments. The prerequisite of administrator access lowers likelihood, but server-side command execution raises impact. Treat this as a high-priority patch for any affected instance.
Technical view
OpenProject allows administrators to configure the sendmail binary path. In affected versions below 16.6.2, that path can lead to arbitrary command execution when sending a test email. The advisory maps this to CWE-77 and CVSS 4.0 score 8.6, with network access, low complexity, and high privileges required.
Likely exposure
Organizations running self-hosted OpenProject versions before 16.6.2 are potentially exposed. The attacker must already be a registered administrator, so risk is highest where admin accounts are broadly assigned, shared, weakly protected, or compromised.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. Exploitation requires authenticated administrator access and interaction with OpenProject email configuration and test email functionality. No public exploit status is established in the supplied sources.
Researcher notes
Evidence is limited to the CVE record, GitHub advisory, and 16.6.2 release reference. The core issue is command injection through administrator-controlled sendmail path used during test email. Do not assume exposure beyond OpenProject versions below 16.6.2.
Mitigation direction
- Upgrade OpenProject to version 16.6.2 or later.
- Review the GitHub security advisory for vendor-specific guidance.
- Limit OpenProject administrator access to necessary trusted users.
- Ensure administrator accounts use strong authentication and are not shared.
Validation and detection
- Inventory OpenProject instances and confirm their running versions.
- Verify affected systems are upgraded to 16.6.2 or later.
- Review administrator account assignments for unnecessary privileges.
- Check recent email configuration changes and test-email activity where logs are available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-22601 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/opf/openproject/security/advisories/GHSA-9vrv-7h26-c7jcCVE reference · x_refsource_CONFIRM
- https://github.com/opf/openproject/releases/tag/v16.6.2CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.