Inappropriate implementation in Chrome for iOS in Google Chrome on iOS prior to 149

CVE-2026-11214 is a same-origin-policy style failure in Chrome for iOS that lets a malicious page leak cross-origin data when opened by a victim using vulnerable builds before 149.0.7827.53. In plain English: a hostile site can trick the browser into exposing data that should stay isolated between websites, so the attacker may read content tied to the victim's already-authenticated web sessions.

The vendor's 6.5 / MEDIUM baseline is close, but a little generous for enterprise patch triage. The impact can be real for targeted users with active SaaS sessions, yet the chain still depends on user interaction, affects only Chrome on iOS, and stays mostly per-user/per-session rather than turning into code execution, device takeover, or tenant-wide compromise.

Why this verdict

• Start from 6.5/MEDIUM: a cross-origin leak in a browser can expose authenticated business data without prior compromise of the target service.
• Downward pressure — requires user interaction: the attacker needs a victim to open malicious content in Chrome for iOS, so modern link filtering, mobile web controls, and plain user behavior break the chain before impact.
• Downward pressure — narrow exposure population: only Chrome on iOS is in scope, which is a materially smaller and more manageable population than desktop Chrome or an internet-facing service.
• Downward pressure — per-user blast radius: successful exploitation rides the victim's own browser session and stays limited to that user's accessible data; it is not remote code execution, not tenant-wide by default, and not a device takeover event.
• No exploitation heat: no KEV listing, no public campaign evidence found, and the supplied EPSS 0.00014 argues against emergency reprioritization.

Why not higher?

This is not unauthenticated server-side compromise, not a wormable service flaw, and not a browser-to-OS escape. The attacker must first capture a user's click in the right mobile browser, then rely on a policy-bypass condition whose public exploit detail is thin, which sharply reduces enterprise-scale burn rate.

Why not lower?

Same-origin boundary failures are not cosmetic. If a targeted user is logged into email, IdP, CRM, or internal web apps in Chrome for iOS, cross-origin leakage can still expose sensitive session-bound data without tripping password defenses.

1. Enforce managed browser updates — Use MDM or enterprise app management to require Chrome for iOS 149.0.7827.53+ on enrolled devices. For a MEDIUM verdict there is no mitigation SLA, so use normal change control and drive directly toward remediation within the 365-day window.
2. Block unapproved mobile browsers where feasible — If your mobile access policy already differentiates browsers, steer sensitive SaaS access to approved, current builds only. This reduces reachable population immediately while you work through mobile fleet hygiene; again, no mitigation SLA applies here.
3. Tighten mobile web filtering — Use secure web gateway, DNS filtering, or enterprise mobile threat defense to reduce user exposure to malicious lure pages and exfil domains. This does not fix the bug, but it cuts the first and last steps of the chain and is appropriate as defense-in-depth during the normal remediation cycle.
4. Prioritize high-value users first — Patch executives, admins, finance, and users with privileged SaaS access before the long tail. This matters because the blast radius is session-bound to the victim, so user value is a better prioritization key than raw device count.
5. Use conditional access for mobile sessions — Where your IdP supports it, require compliant device posture or approved app conditions before granting access to sensitive web apps from mobile browsers. That helps reduce the number of vulnerable sessions available to exploit while remediation proceeds.

Run this on your auditor workstation, CI job, or MDM reporting host against a CSV export of mobile app inventory. Invoke it as python3 check_cve_2026_11214.py mdm_apps.csv with a file containing at least AppName and Version columns; no admin rights are required unless your MDM export process itself needs them.

#!/usr/bin/env python3
# check_cve_2026_11214.py
#
# Purpose:
#   Audit a CSV inventory export for vulnerable Chrome for iOS versions affected by CVE-2026-11214.
#
# Expected CSV columns:
#   AppName, Version
# Optional columns are ignored.
#
# Output:
#   VULNERABLE - at least one Chrome for iOS entry is below 149.0.7827.53
#   PATCHED    - at least one Chrome for iOS entry is present and all parsed versions are >= 149.0.7827.53
#   UNKNOWN    - no matching Chrome rows found, missing columns, or unparseable version data
#
# Exit codes:
#   1 = VULNERABLE
#   0 = PATCHED
#   2 = UNKNOWN

import csv
import re
import sys
from pathlib import Path

FIXED = (149, 0, 7827, 53)


def parse_version(value):
    if value is None:
        return None
    m = re.search(r'(\d+)\.(\d+)\.(\d+)\.(\d+)', value.strip())
    if not m:
        return None
    return tuple(int(x) for x in m.groups())


def is_chrome_ios(app_name):
    if not app_name:
        return False
    name = app_name.strip().lower()
    return 'chrome' in name


def main():
    if len(sys.argv) != 2:
        print('UNKNOWN - usage: python3 check_cve_2026_11214.py <mdm_inventory.csv>')
        sys.exit(2)

    csv_path = Path(sys.argv[1])
    if not csv_path.exists() or not csv_path.is_file():
        print(f'UNKNOWN - file not found: {csv_path}')
        sys.exit(2)

    found = 0
    parsed = 0
    vulnerable = []
    patched = []

    try:
        with csv_path.open(newline='', encoding='utf-8-sig') as fh:
            reader = csv.DictReader(fh)
            if not reader.fieldnames:
                print('UNKNOWN - CSV has no header row')
                sys.exit(2)

            headers = {h.strip().lower(): h for h in reader.fieldnames if h}
            app_col = headers.get('appname') or headers.get('app_name') or headers.get('application') or headers.get('app')
            ver_col = headers.get('version') or headers.get('appversion') or headers.get('app_version')

            if not app_col or not ver_col:
                print('UNKNOWN - required columns not found; need AppName and Version (or close equivalents)')
                sys.exit(2)

            for row in reader:
                app = row.get(app_col, '')
                ver = row.get(ver_col, '')
                if not is_chrome_ios(app):
                    continue

                found += 1
                parsed_ver = parse_version(ver)
                if parsed_ver is None:
                    continue

                parsed += 1
                if parsed_ver < FIXED:
                    vulnerable.append((app, ver))
                else:
                    patched.append((app, ver))

    except Exception as e:
        print(f'UNKNOWN - failed to read CSV: {e}')
        sys.exit(2)

    if vulnerable:
        sample = '; '.join([f'{a} {v}' for a, v in vulnerable[:5]])
        extra = '' if len(vulnerable) <= 5 else f' (+{len(vulnerable) - 5} more)'
        print(f'VULNERABLE - found {len(vulnerable)} Chrome entry/entries below 149.0.7827.53: {sample}{extra}')
        sys.exit(1)

    if found == 0:
        print('UNKNOWN - no Chrome rows found in inventory')
        sys.exit(2)

    if parsed == 0:
        print('UNKNOWN - Chrome rows found but version strings were not parseable')
        sys.exit(2)

    print(f'PATCHED - scanned {parsed} parseable Chrome entry/entries; all are >= 149.0.7827.53')
    sys.exit(0)


if __name__ == '__main__':
    main()

Sources

1. Google Chrome Releases - Stable Channel Update for Desktop (includes CVE-2026-11214 listing)
2. Chromium issue reference for CVE-2026-11214
3. Vulnerability-Lookup entry cluster for Chrome June 2026 CVEs
4. CISA Known Exploited Vulnerabilities Catalog
5. FIRST EPSS overview
6. FIRST EPSS FAQ
7. FIRST EPSS API documentation
8. Google Chrome Help - Update Chrome on iPhone and iPad