CVE-2026-9308

Published Jun 1, 2026

Last updated 4 days ago

CVSS medium 5.4

Overview

Description: Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was fixed in Firefox for iOS 151.2.
Source: security@mozilla.org
NVD status: Analyzed
Products: firefox

Risk scores

CVSS 3.1

Type: Secondary
Base score: 5.4
Impact score: 2.5
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Severity: MEDIUM

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-79

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:*",
            "matchCriteriaId": "B45EA8E8-B058-45B8-B0AB-77F61594BC17",
            "versionEndExcluding": "151.2",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.