{"id":"CVE-2026-12171","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-12171","generatedAt":"2026-10-28T01:02:55.580Z","title":"The handlebarsSetup option is passed to require(), so running auto-changelog over attacker-controlled repository content (for example, in a CI workflow that checks out an untrusted pull request head, or locally on a forked or third-party repository)…","description":"auto-changelog before 2.6.1 merges configuration from inside the target repository (the .auto-changelog file and the auto-changelog key in package.json) into its options, and honors security-sensitive options from that untrusted source. The handlebarsSetup option is passed to require(), so running auto-changelog over attacker-controlled repository content (for example, in a CI workflow that checks out an untrusted pull request head, or locally on a forked or third-party repository) executes attacker-chosen code with the privileges of the invoking user or CI job, including access to workflow secrets, without the repository dependencies ever being installed. The plugins option similarly loads attacker-controlled modules from the repository. Under the same conditions, appendGitLog/appendGitTag allow git argument injection (e.g. --output= to write arbitrary files), output allows writing attacker-influenced content to arbitrary paths, and template causes an outbound request to an attacker-chosen URL. Version 2.6.1 treats in-repository configuration as untrusted and refuses to run when it sets these options, unless the new --unsafe-config flag is passed.","published":"2026-10-05T17:17:15.000Z","lastModified":"2026-10-06T16:08:43.000Z","status":"Deferred","sourceIdentifier":"7ffcee3d-2c14-4c3e-b844-86c6a321a158","cvss":{"version":"4.0","score":8.4,"severity":"HIGH","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-22","CWE-88","CWE-94","CWE-829","CWE-918"],"affected":[],"epss":{"score":0.00218,"percentile":0.12195,"date":"2026-10-26","history":[{"date":"2026-10-06","score":0.00218,"percentile":0.112}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-05T17:17:15.000Z","detail":{"score":"8.4","severity":"HIGH","publishedAt":"2026-10-05T17:17:14.510Z"},"summary":"New CVE, high severity (CVSS 8.4)."}],"references":[{"url":"https://github.com/cookpete/auto-changelog/commit/1d02a48a0a57c69a3cd268aca375d64d50877c1a","source":"7ffcee3d-2c14-4c3e-b844-86c6a321a158"},{"url":"https://github.com/cookpete/auto-changelog/security/advisories/GHSA-xpvr-2hvx-m8q4","source":"7ffcee3d-2c14-4c3e-b844-86c6a321a158"},{"url":"https://github.com/cookpete/auto-changelog/security/advisories/GHSA-xpvr-2hvx-m8q4","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-12171","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}