CVE-2026-91772 Halo through 2.26.1 Open Redirect via Unvalidated URI Parameter
Attackers can craft malicious links on the Halo domain to redirect users to external sites, facilitating phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-91772?
CVE-2026-91772 is a medium-severity vulnerability in halo-dev halo, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-91772?
How do I fix CVE-2026-91772?
No fix has been published for CVE-2026-91772 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-91772 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91772 exists.
Sources
Also known as GHSA-fvx2-w6cp-9mrg.