CVE-2026-9309Disclosure(mozilla / firefox)

LOWCVSS 5.4 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScript execution in an internal origin. This vulnerability was fixed in Firefox for iOS 151.2.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • firefox

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-06-01); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
Products
firefox

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-01: 1Mentions · 2026-06-03: 1Technical Details · 2026-06-01: 1Technical Details · 2026-06-03: 106-0106-03
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • DailyCVE@dailycve
    Disclosure

    🟠 #Firefox for #iOS, Cross‑Site Scripting (XSS), #CVE‑2026‑9309 (Medium) -DC-Jun2026-172 https://dailycve.com/firefox-for-ios-cross-site-scripting-xss-cve-2026-9309-medium-dc-jun2026-172/

    Post summary

    The tweet announces a medium‑severity XSS vulnerability (CVE‑2026‑9309) in Firefox for iOS, providing the CVE ID and a link to DailyCVE for details, but no exploitation or patch information.

    0000052
    208 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-9309 HTML Injection in Firefox for iOS Reader View JSON-LD Metadata Before 151... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-9309 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3

    Post summary

    The text announces a new HTML injection vulnerability (CVE-2026-9309) in Firefox for iOS Reader View prior to version 151, providing links for further details.

    0000061
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox-iphone_os-

Explore more