CVE-2026-91772
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
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.
Risk Assessment
Users may be redirected to malicious sites, increasing the risk of phishing and credential theft.
Recommendation
Upgrade Halo to a version that includes the fix for validating the uri parameter in the thumbnail endpoint.
Other vulnerabilities in Halo
See all- CVE-2026-97182High
A security vulnerability has been detected in halo-dev Halo up to 2.25.4/2.26.1. Affected is an unknown function of the file application/src/main/java/run/halo/app/content/comment/ReplyNotificationSubscriptionHelper.java of the SpEL Handler component. Such manipulation leads to improper neutralization.
- CVE-2026-67919Critical
An issue in Halo 2.25.4 allows a remote attacker to execute arbitrary code via the PluginEndpoint.java, installFromUri method, and DefaultPluginApplicationContextFactory components.
- CVE-2026-78971Medium
In Halo <= 2.25.4, the plugin management feature allows users to install/update malicious plugins, which could let attackers execute any command with Halo process permissions.
- CVE-2026-67920High
An issue in Halo 2.25.4 allows a remote attacker to execute arbitrary code via the run.halo.app.migration.impl.MigrationServiceImpl.restoreWorkdir(), and org.springframework.util.FileSystemUtils.copyRecursively() components.
- CVE-2026-15326Low
A path traversal vulnerability was found in halo-dev halo up to version 2.24.2 in the ThemeUtils.unzipThemeTo function of ThemeUtils.java during theme installation. Manipulating the metadata.name argument allows remote exploitation, and a public exploit is available.
- CVE-2026-55439Medium
Halo is an open source website building tool. Prior to version 2.24.3, a path traversal vulnerability in the backup download endpoint allows authenticated administrators to read arbitrary files from the server filesystem.
- CVE-2025-51857Medium
An XSS vulnerability in the reconcile method of the AttachmentReconciler class in Halo system v.2.20.18LTS and earlier allows an attacker to inject malicious scripts.
- CVE-2023-27164Medium
An arbitrary file upload vulnerability in Halo up to v1.6.1 allows attackers to execute arbitrary code via a crafted .md file.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS