CVE-2026-91772

Halo through 2.26.1 contains an open redirect vulnerability in the anonymous thumbnail endpoint that fails to validate the uri query parameter. Attackers can craft malicious links on the trusted Halo domain that redirect visitors to arbitrary external sites, enabling phishing attacks and abuse of redirect-based trust relationships.

  • Published Sep 15, 2026
  • CVSS 5.3 medium
  • 0.3% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-91772 at the National Vulnerability Database