CVE-2026-91772
Halo through 2.26.1 Open Redirect via Unvalidated URI Parameter
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | halo-dev |
| Product | halo |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
halo-dev / halo
0 ≤ 2.26.1
References
github.com: https://github.com/halo-dev/halo/issues/10247 github.com: https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/java/run/halo/app/core/endpoint/theme/ThumbnailEndpoint.java#L76-L98 github.com: https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/resources/extensions/role-template-anonymous.yaml#L53-L55 github.com: https://github.com/halo-dev/halo vulncheck.com: https://www.vulncheck.com/advisories/halo-through-2.26.1-open-redirect-via-unvalidated-uri-parameter
Credits
🔍 George Chen