Generation of Predictable Numbers or Identifiers in Ivanti Connect Secure (formerly Pulse Connect Secure) - CVE-2026-118527

Vulnerability details

The vulnerability allows a remote user to upload files with attacker-controlled content to a known location on disk.

The vulnerability exists due to the use of predictable filenames in Ivanti Connect Secure when handling file uploads. A remote user can upload files using predictable filenames to place controlled content at a known location on disk.

Note, the vulnerability is being actively exploited in the wild.

Affected software

How to mitigate CVE-2026-118527

External References

• https://hub.ivanti.com/s/article/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US
• https://www.volexity.com/blog/2026/10/13/a-series-of-unauthenticated-events-chained-exploitation-of-ivanti-connect-secure-zero-days/

Related Security Bulletins

• Multiple vulnerabilities in Ivanti Connect Secure