{"answers":{"affected":"2 open source packages ship an affected version, including @tdurieux/anonymous_github.","exploited":"There is no known exploitation of GHSA-g485-8j3v-p6x8 in the wild and no public exploit code.","fix":"Upgrade @tdurieux/anonymous_github to 2.3.0 or later.","what":"GHSA-g485-8j3v-p6x8 is a cross-site scripting vulnerability in @tdurieux/anonymous_github, published on 5 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for GHSA-g485-8j3v-p6x8 and fix it if it is affected.\n\nWhat it is: GHSA-g485-8j3v-p6x8 is a cross-site scripting vulnerability in @tdurieux/anonymous_github, published on 5 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of GHSA-g485-8j3v-p6x8 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @tdurieux/anonymous_github (npm): affected from 2.2.0; fixed in 2.3.0\n- @tdurieux/anonymous_github (npm): affected from 2.2.0; fixed in 2.3.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/GHSA-g485-8j3v-p6x8/ (Markdown: https://insights.sbomify.com/GHSA-g485-8j3v-p6x8/index.md)","id":"GHSA-g485-8j3v-p6x8","markdown":"https://insights.sbomify.com/GHSA-g485-8j3v-p6x8/index.md","name":"GHSA-g485-8j3v-p6x8","record":{"aliases":[],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Anonymous GitHub","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript in the Anonymous GitHub origin by crafting malicious repository READMEs, potentially leading to account takeover.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"### Summary\n\nAnonymous GitHub fetches repository content (e.g., markdown files) from GitHub's API and renders it without sanitization. On the client side, markdown is parsed with `marked` (with `sanitize: false`) and injected into the DOM via `$sce.trustAsHtml()` + `ng-bind-html`, bypassing AngularJS's built-in XSS protection. An attacker can craft a malicious GitHub repository whose README executes arbitrary JavaScript in the Anonymous GitHub origin.\n\n### Details\n\n#### README fetched from GitHub API\n\nThe server fetches the README via GitHub's REST API and stores the raw markdown in MongoDB:\n\n```typescript\n// https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/src/core/source/GitHubRepository.ts#L162-L174\nconst ghRes = await oct.repos.getReadme({\n  owner: this.owner,\n  repo: this.repo,\n  ref: selected?.commit,\n});\nconst readme = Buffer.from(\n  ghRes.data.content,\n  ghRes.data.encoding as BufferEncoding\n).toString(\"utf-8\");\nselected.readme = readme;\nawait model.save();\n```\n\nIt is then served to the client with no sanitization:\n\n```typescript\n// https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/src/server/routes/repository-private.ts#L254-L260\nreturn res.send(\n  await repo.readme({\n    accessToken: token,\n    force: req.query.force == \"1\",\n    branch: req.query.branch as string,\n  })\n);\n```\n\n#### Client-side rendering via `$sce.trustAsHtml()` + `ng-bind-html`\n\nThe client fetches the raw README, parses it with `renderMD()` (which uses `marked` with `sanitize: false`), then bypasses AngularJS sanitization:\n\n```javascript\n// https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/public/script/app.js#L1219-L1226\nconst res = await $http.get(`/api/repo/${o.owner}/${o.repo}/readme`, {\n  params: { force: force === true ? \"1\" : \"0\", branch: $scope.source.branch },\n});\n$scope.readme = res.data;\n```\n\n```javascript\n// https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/public/script/app.js#L1339-L1343\nconst html = renderMD(\n  $scope.anonymize_readme,\n  `https://github.com/${o.owner}/${o.repo}/raw/${$scope.source.branch}/`\n);\n$scope.html_readme = $sce.trustAsHtml(html);  // sink: bypasses Angular XSS protection\n```\n\nThe `renderMD()` function explicitly disables sanitization:\n\n```javascript\n// https://github.com/tdurieux/anonymous_github/blob/b2d77faa6c6f35ad9ae6ed46e3a3fa4681ac84c2/public/script/utils.js#L165-L176\nmarked.setOptions({\n  sanitize: false,  // HTML in markdown is preserved as-is\n  // ...\n});\nreturn marked.parse(md, { renderer });\n```\n\nThe resulting HTML is bound to the DOM via `ng-bind-html`, which trusts the string marked by `$sce.trustAsHtml()` and inserts it as innerHTML.\n\n### Impact\n\n1. **Stored XSS**: Any malicious GitHub repository can execute JavaScript in the Anonymous GitHub origin when a user anonymizes it or views its content\n2. **Account Takeover**: Steal authentication tokens and session cookies\n3. **Data Exfiltration**: Access other users' anonymization configurations and private repository data via `/api/user` and `/api/repo/list`\n\n### Proof of Concept\n\n![poc-xss-anonymous-github](https://github.com/user-attachments/assets/c1bf3ed9-4e1e-4c8e-87f0-782a8d5f6ead)\n\n1. Create a GitHub repository with a malicious `README.md`:\n\n```markdown\n# Innocent README\n\u003cimg src=x onerror=\"alert(document.domain)\"\u003e\n```\n\n2. On Anonymous GitHub, enter the malicious repository URL to anonymize it\n3. The XSS executes immediately when the README preview is rendered on the anonymize page\n\n### Remediation\n\n1. Sanitize markdown output with DOMPurify before rendering (the dependency already exists but is unused)\n2. Serve HTML files with `Content-Disposition: attachment` or in a sandboxed iframe on a separate origin\n3. Replace `$sce.trustAsHtml()` with proper `ngSanitize` usage\n4. HTML-escape filenames and paths in directory listing templates\n5. Add Content Security Policy headers\n\n### Credits\n\nZhengyu Liu, Jingcheng Yang","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":true,"headline":"Anonymous GitHub fetches repository content (e.g., markdown files) from GitHub's API and renders it without sanitization.","id":"GHSA-g485-8j3v-p6x8","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":null,"packages":[{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["2.2.0"],"last_affected":[],"package":"@tdurieux/anonymous_github","purl":null,"source":"GHSA-g485-8j3v-p6x8"},{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["2.2.0"],"last_affected":[],"package":"@tdurieux/anonymous_github","purl":"pkg:npm/%40tdurieux/anonymous_github","source":"GHSA-g485-8j3v-p6x8"}],"products":null,"published":"2026-05-05","related":[],"sources":[{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":"Attackers can execute arbitrary JavaScript in the Anonymous GitHub origin by crafting malicious repository READMEs, potentially leading to account takeover.","url":"https://insights.sbomify.com/GHSA-g485-8j3v-p6x8/"}