CVE-2023-49060Public exploitNetwork attack vector

Internal-page access via ReaderMode key exfiltration

Published Nov 21, 2023 · Updated Aug 2, 2024

Privilege escalation in Mozilla Firefox for iOS before 120 allows remote attackers to access internal pages and data through ReaderMode. ReaderMode preserves an attacker-controlled link referrerpolicy attribute, which overrides the template policy and sends the secret uuidkey in the Referer header. Exploitation requires a user to open the crafted page in Reader Mode and tap its link; the leaked key permits access to privileged internal content.

CVSS severity9.8
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Mozilla Firefox for iOS before 120 allows remote attackers to access internal pages and data through ReaderMode. ReaderMode preserves an attacker-controlled link referrerpolicy attribute, which overrides the template policy and sends the secret uuidkey in the Referer header. Exploitation requires a user to open the crafted page in Reader Mode and tap its link; the leaked key permits access to privileged internal content.

The record

CVE
CVE-2023-49060
Published
Nov 21, 2023
Updated
Aug 2, 2024
Vendor
Mozilla
Product
Firefox for iOS
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <120

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefox for iOSversion=unspecified <120

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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