Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-53899— Cross-origin cookies could be leaked when opening a PDF link

Quick assessment

Affected
Mozilla Firefox for iOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox for iOS是Mozilla基金会的移动端网页浏览器。 Mozilla Firefox for iOS 152.0之前版本存在输入验证错误漏洞，该漏洞源于附加cookie到PDF请求时使用部分域匹配，可能导致后缀域中的恶意站点接收目标站点的cookie。

AI Predicted 5.3 Difficulty: Easy EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1539 · Steal Web Session Cookie

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mozilla Firefox for iOS 152.0≤ * unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53899

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Cross-origin cookies could be leaked when opening a PDF link
Source: CVE Program / CVE List V5
Vulnerability Description
Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox for iOS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox for iOS是Mozilla基金会的移动端网页浏览器。 Mozilla Firefox for iOS 152.0之前版本存在输入验证错误漏洞，该漏洞源于附加cookie到PDF请求时使用部分域匹配，可能导致后缀域中的恶意站点接收目标站点的cookie。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox for iOS 152.0 ~ * -

II. Public POCs for CVE-2026-53899

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-53899

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-53899 (1)

Vendor Advisories for CVE-2026-53899 (1)

Same Patch Batch · Mozilla · 2026-06-16 · 44 CVEs total

CVE-2026-12300 Memory safety bug fixed in Firefox 152
CVE-2026-12297 Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12298 Memory safety bug fixed in Firefox 152
CVE-2026-12296 Sandbox escape in the Security: Process Sandboxing component
CVE-2026-12293 Use-after-free in the Graphics: WebGPU component
CVE-2026-12292 Incorrect boundary conditions in the Web Audio component
CVE-2026-12291 Use-after-free in the Networking: HTTP component
CVE-2026-12290 Memory safety bug fixed in Firefox 152
CVE-2026-12289 Privilege escalation in the Graphics: WebRender component
CVE-2026-12294 Sandbox escape in the DOM: Workers component
CVE-2026-12299 JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12301 Memory safety bug fixed in Firefox 152
CVE-2026-12302 Mitigation bypass in the DOM: Security component
CVE-2026-12303 Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU compon
CVE-2026-12304 Same-origin policy bypass in the Networking: Cookies component
CVE-2026-12305 Memory safety bug fixed in Firefox 152
CVE-2026-12306 Memory safety bug fixed in Firefox 152
CVE-2026-12307 Memory safety bug fixed in Firefox 152
CVE-2026-12308 Memory safety bug fixed in Firefox 152
CVE-2026-12309 Memory safety bug fixed in Firefox 152

Showing top 20 of 44 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox for iOS
Same vendor: Mozilla

V. Comments for CVE-2026-53899

No comments yet

Leave a comment