# Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI-Generator online generator Advisory record · `GHSA-23x4-m842-fmwf` - **Identifiers:** `GHSA-23x4-m842-fmwf` · `CVE-2021-21428` - **State:** Confirmed - **Severity:** CVSS 9.3 Critical - **Critical:** Yes: CVSS 9+ - **Weakness (CWE):** [CWE-269](https://cwe.mitre.org/data/definitions/269.html) · [CWE-377](https://cwe.mitre.org/data/definitions/377.html) · [CWE-378](https://cwe.mitre.org/data/definitions/378.html) · [CWE-379](https://cwe.mitre.org/data/definitions/379.html) · [CWE-668](https://cwe.mitre.org/data/definitions/668.html) - **Tags:** [Privilege escalation](https://agentprime.io/advisories/tag/privilege-escalation.md) · [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [CWE-377](https://agentprime.io/advisories/tag/cwe-377.md) · [CWE-378](https://agentprime.io/advisories/tag/cwe-378.md) · [CWE-379](https://agentprime.io/advisories/tag/cwe-379.md) - **Published:** 11 May 2021 - **Updated:** 8 Jul 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 11 May 2021, 00:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Critical Critical, because: - CVSS score 9.3: 9.0 or more. How we decide what’s critical: ## Affected packages - `org.openapitools:openapi-generator-online` (Maven): affected `<5.1.0`; fixed in `5.1.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The openapi-generator-online package (Maven org.openapitools:openapi-generator-online) is vulnerable in versions before 5.1.0. On Unix-like systems, a local user on the same machine can race the creation of a temporary directory used during code generation, and then append to generated files, which can lead to local privilege escalation. Upgrade to version 5.1.0 or later. Written 2 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 9.3 Critical, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:20 UTC: First seen by agentprime - 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-23x4-m842-fmwf) ## Sources - [GitHub Advisory Database: GHSA-23x4-m842-fmwf](https://github.com/advisories/GHSA-23x4-m842-fmwf) - [OSV: GHSA-23x4-m842-fmwf](https://osv.dev/vulnerability/GHSA-23x4-m842-fmwf) - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .