CVE-2026-16353

⛔ critical

Summary

Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS Score

9.8

Critical

EPSS Score

0.4

Exploit Probability

Published Date

2026-07-21

First Seen: 2026-07-22

📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.5% of all 338,292 vulnerabilities in our database.

#31,990

Top 10% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jul 22, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

fedek

SSVC data provided by CISA

Last Modified 2026-07-24

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-416 CWE-476 CWE-824

📦 Affected Products 5

Vendor	Product	Status	Affected Versions
mozilla	firefox	Affected	< 115.38.0
mozilla	firefox	Affected	> 128.1.0 < 140.13.0
mozilla	firefox	Affected	< 153.0.0
mozilla	thunderbird	Affected	< 140.13.0
mozilla	thunderbird	Affected	> 141.0 < 153.0

🔗 References 6

https://bugzilla.mozilla.org/show_bug.cgi?id=2049523

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-16349	⛔ critical	9.8	0.2	Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115...	2026-07-21
CVE-2026-16350	⛔ critical	9.8	0.4	Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ...	2026-07-21
CVE-2026-16351	⛔ critical	9.8	0.4	Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Fire...	2026-07-21
CVE-2026-16352	⛔ critical	9.8	0.4	Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 15...	2026-07-21
CVE-2026-16354	⚠️ high	7.5	0.3	Information disclosure in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153, Firefox ESR 115...	2026-07-21
CVE-2026-16355	⛔ critical	9.8	0.4	JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115...	2026-07-21

These CVEs affect the same products