NVD / CVE Program· CNA mozilla

CVE-2024-9391: A user who enables full-screen mode on a specially crafted web page could potentially be prevented from exiting full screen mode.

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.28% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: firefox-esr (openSUSE:Tumbleweed) 153.0-1.1; MozillaFirefox (openSUSE:Tumbleweed) 131.0-1.1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to firefox-esr (openSUSE:Tumbleweed) 153.0-1.1; MozillaFirefox (openSUSE:Tumbleweed) 131.0-1.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A user who enables full-screen mode on a specially crafted web page could potentially be prevented from exiting full screen mode. This may allow spoofing of other sites as the address bar is no longer visible. *This bug only affects Firefox Focus for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 131.

MediumCVSS 6.5 · v3.1—No exploit Fix available

Published: Oct 1, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 20th percentile
CWE: CWE-290

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
mozilla	firefox	cpe:2.3:a:mozilla:firefox

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

mozilla firefoxbefore 131.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

Mozilla Firefox
- unspecified and later · before 131affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
openSUSE:Tumbleweed	firefox-esr	before 153.0-1.1	153.0-1.1
openSUSE:Tumbleweed	MozillaFirefox	before 131.0-1.1	131.0-1.1

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
94Now
CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
87Now
CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
86Now

Published before and after this one in the same product

← EarlierCVE-2024-8897Sep 17, 2024 · Under certain conditions, an attacker with the ability to redirect users to a malicious site via an open redirect on a trusted site, may be
26Monitor
← EarlierCVE-2024-8900Sep 17, 2024 · An attacker could write data to the user's clipboard, bypassing the user prompt, during a certain sequence of navigational events.
30Monitor
Later →CVE-2024-9392Oct 1, 2024 · A compromised content process could have allowed for the arbitrary loading of cross-origin pages.
39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
opensuse:firefox-esr	153.0-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:MozillaFirefox	131.0-1.1 · openSUSE:Tumbleweed	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

James Lee

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-2800511 days apartSpoofing issue in the WebAuthn component in Firefox for Android
39Monitor
CVE-2023-32207487 days apartA missing delay in popup notifications could have made it possible for an attacker to trick a user into granting permissions.
35Monitor
CVE-2024-1555224 days apartWhen opening a website using the `firefox://` protocol handler, SameSite cookies were not properly respected.
33Monitor
CVE-2025-14327434 days apartSpoofing issue in the Downloads Panel component
30Monitor
CVE-2025-3029182 days apartURL Bar Spoofing via non-BMP Unicode characters
29Monitor
CVE-2024-1046528 days apartA clipboard "paste" button could persist across tabs which allowed a spoofing attack.
26Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).