CVE-2024-11698 [Critical] | Security Vulnerability in Firefox

A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen mode when a modal dialog was opened during the transition. This issue left users unable to exit fullscreen mode using standard actions like pressing "Esc" or accessing right-click menus, resulting in a disrupted browsing experience until the browser is restarted. *This bug only affects the application when running on macOS. Other operating systems are unaffected.* This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.23%	0.68%	+0.45%
2	2026-01-04	0.67%	0.23%	-0.45%
3	2025-11-21	—	0.67%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.23%

0.68%

+0.45%

2026-01-04

0.67%

0.23%

-0.45%

2025-11-21

—

0.67%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

OS Trackers for CVE-2024-11698

vendor	priority	summary	link
`alpine`	—	CVE-2024-11698: 3 source package rows (firefox, firefox-esr, thunderbird); 336 state rows across 3 repos (3.20-community, 3.22-community, edge-community); fixed 0, open 336.	https://security.alpinelinux.org/vuln/CVE-2024-11698
`debian`	unimportant	CVE-2024-11698 unimportant priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11.	https://security-tracker.debian.org/tracker/CVE-2024-11698
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2024-11698
`suse`	critical	CVE-2024-11698 severity critical: SUSE including 29 source package names (MozillaFirefox-128.5.0-112.237.2, MozillaFirefox-128.5.0-150200.152.161.1, …), 144 product×package rows across 49 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (49 product lines)): Fixed 144.	https://www.suse.com/security/cve/CVE-2024-11698/
`ubuntu`	medium	CVE-2024-11698 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (focal, jammy, noble, oracular, upstream): not-affected 8, DNE 2.	https://ubuntu.com/security/CVE-2024-11698

Affected software / configurations for CVE-2024-11698

Vendor	Product	Version	Raw CPE
mozilla	firefox	< 128.5.0	cpe:2.3:a:mozilla:firefox:::::esr:::*
mozilla	firefox	< 133.0	cpe:2.3:a:mozilla:firefox:::::-:::*
mozilla	thunderbird	< 128.5.0	cpe:2.3:a:mozilla:thunderbird::::::::
mozilla	thunderbird	>= 129.0, < 133.0	cpe:2.3:a:mozilla:thunderbird::::::::

References for CVE-2024-11698

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1916152	Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2024-63/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-64/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-67/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-68/	Vendor Advisory

URL

CVE-2024-11698

Exploit prediction scoring system (EPSS) score for CVE-2024-11698

Common vulnerability scoring system (CVSS) metrics for CVE-2024-11698

Weakness enumeration for CVE-2024-11698

OS Trackers for CVE-2024-11698

Affected software / configurations for CVE-2024-11698

References for CVE-2024-11698