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CVE-2026-53900— Cookie injection was possible 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。 Firefox for iOS 152.0之前版本存在安全漏洞，该漏洞源于TemporaryDocument中存在跨源HTTP重定向时保留初始PDF请求设置的cookies问题，可能导致恶意站点向不相关目标域名的请求中注入任意cookies。

AI Predicted 4.3 Difficulty: Easy EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mozilla Firefox for iOS 152.0≤ * unaffected
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I. Basic Information for CVE-2026-53900

Vulnerability Information
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Vulnerability Title
Cookie injection was possible when opening a PDF link
Source: CVE Program / CVE List V5
Vulnerability Description
Firefox for iOS preserved cookies set on the initial PDF request across cross-origin HTTP redirects in TemporaryDocument, allowing a malicious site to inject arbitrary cookies into requests to an unrelated target domain. 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。 Firefox for iOS 152.0之前版本存在安全漏洞，该漏洞源于TemporaryDocument中存在跨源HTTP重定向时保留初始PDF请求设置的cookies问题，可能导致恶意站点向不相关目标域名的请求中注入任意cookies。
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-2026-53900

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III. Intelligence Information for CVE-2026-53900

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Patches & Fixes for CVE-2026-53900 (1)

Vendor Advisories for CVE-2026-53900 (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-2026-53900

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