[NEW] [medium] Mozilla Firefox for iOS: Vulnerability allows display of false information

mediumCVE-2026-13356

A remote, anonymous attacker can exploit a vulnerability in Mozilla Firefox to display false information.

CSIRTS triage

vendor: Mozilla product: Firefox for iOSOther

What: A remote, anonymous attacker can exploit a vulnerability in Mozilla Firefox to display false information.
Who is affected: Users of Mozilla Firefox for iOS are affected.
Urgency: Remediation is medium urgency as the severity is medium and exploitation is possible.
Action: Update to the latest version of Firefox for iOS.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Firefox for iOS

Get an email when a new Firefox for iOS advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-07
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2214

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-133560.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-13356	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Mozilla Firefox for iOS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownVulnerability in Mozilla Firefox for iOS (July 7, 2026)cert-fr-avis · 2026-07-07