ZDI-CAN-28587: Security vulnerability
Published Nov 4, 2026
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-121753.
Frequently Asked Questions
1
Is an affected installation exposed through network access alone?
No. Exploitation requires user interaction: the target must visit a malicious page or open a malicious file.
2
What user activity should be treated as a potential trigger while this issue remains unaddressed?
Opening untrusted files and visiting malicious web pages can trigger exploitation on affected installations.