{"id":"CVE-2026-73539","title":"Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting","summary":"Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments,…","severity":"high","cwe":["CWE-88"],"published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T16:04:39.483","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73539","references":[{"url":"https://blog.gitea.com/release-of-1.27.2/","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/38885","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/38898","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v1.27.2","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-579w-82gf-89m2","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-14T15:36:14.030Z","vendor":"Gitea","product":"gitea","affected":["gitea <= 1.27.1"],"epss":0.00475,"epssPercentile":0.40835,"cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-18T13:32:47.376516Z"},"cvssSource":"adp","slug":"CVE-2026-73539","body":"## Overview\n\nGitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224425,"id":"CVE-2026-73539","ts":1792331051248,"field":"cvss","old":null,"new":"7.5"},{"seq":224424,"id":"CVE-2026-73539","ts":1792331051248,"field":"severity","old":"none","new":"high"}]}