{"id":"CVE-2026-91772","title":"Halo through 2.26.1 contains an open redirect vulnerability in the anonymous thumbnail endpoint that fails to validate the uri query parameter","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 arbi…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-601"],"vendor":"halo-dev","product":"halo","affected":["halo <= 2.26.1"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T17:18:19.283","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91772","references":[{"url":"https://github.com/halo-dev/halo","label":"disclosure@vulncheck.com"},{"url":"https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/java/run/halo/app/core/endpoint/theme/ThumbnailEndpoint.java#L76-L98","label":"disclosure@vulncheck.com"},{"url":"https://github.com/halo-dev/halo/blob/v2.26.1/application/src/main/resources/extensions/role-template-anonymous.yaml#L53-L55","label":"disclosure@vulncheck.com"},{"url":"https://github.com/halo-dev/halo/issues/10247","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/halo-through-2.26.1-open-redirect-via-unvalidated-uri-parameter","label":"disclosure@vulncheck.com"},{"url":"https://github.com/halo-dev/halo/issues/10247","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T16:56:20.882562Z"},"epss":0.00183,"epssPercentile":0.08167,"ingestedAt":"2026-09-15T02:19:07.442Z","slug":"CVE-2026-91772","body":"## Overview\n\nHalo 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":205607,"id":"CVE-2026-91772","ts":1789581713306,"field":"exploit_available","old":"false","new":"true"}]}