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

AI Predicted 5.3 Difficulty: Easy EPSS 0.10% · P1

Possible ATT&CK Techniques 1AI

T1539 · Steal Web Session Cookie

Affected Version Matrix 1

VendorProductVersion RangeStatus
MozillaFirefox for iOS152.0≤ *unaffected
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I. Basic Information for CVE-2026-53899

Vulnerability Information
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Vulnerability Title
Cross-origin cookies could be leaked when opening a PDF link
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
MozillaFirefox for iOS 152.0 ~ * -

II. Public POCs for CVE-2026-53899

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III. Intelligence Information for CVE-2026-53899

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

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