CVE-2026-8970

⚠️ high

Summary

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS Score

8.8

High

EPSS Score

0.3

Exploit Probability

Published Date

2026-05-19

First Seen: 2026-05-20

📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 81.1% of all 338,292 vulnerabilities in our database.

#64,055

Top 25% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 20, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

pakhunov.anton.n

SSVC data provided by CISA

Last Modified 2026-07-23

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-269

📦 Affected Products 4

Vendor	Product	Status	Affected Versions
mozilla	firefox	Affected	< 140.11.0
mozilla	firefox	Affected	< 151.0.0
mozilla	thunderbird	Affected	< 140.11
mozilla	thunderbird	Affected	< 151.0.0

🔗 References 5

https://bugzilla.mozilla.org/show_bug.cgi?id=2032174

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

🔗 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-2026-16353	⛔ critical	9.8	0.4	Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38...	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

These CVEs affect the same products