CVE-2026-8971

🔶 medium

Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS Score

6.5

Medium

EPSS Score

0.2

Exploit Probability

Published Date

2026-05-19

First Seen: 2026-05-20

This CVE is Lower Risk - more severe than 46.6% of all 365,890 vulnerabilities in our database.

#195,497

Below average severity

Severity Percentile

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Surya Dev Singh

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:N/S:U/C:L/I:L/A:N

CWE IDs (Weakness Types)

CWE-346

📦 Affected Products 2

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

Permissions Required

Vendor Advisory

Vendor Advisory

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-100756	⚠️ high	8.1	0.3	Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4,...	2026-09-29
CVE-2026-100767	⚠️ high	8.8	0.3	Use-after-free in the Networking: Cache component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, T...	2026-09-29
CVE-2026-100768	⚠️ high	8.8	0.3	Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.	2026-09-29
CVE-2026-100769	⚠️ high	8.8	0.3	Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird ...	2026-09-29
CVE-2026-100770	⛔ critical	9.6	0.3	Sandbox escape due to use-after-free in the DOM: Content Processes component. This vulnerability was fixed in Firefox ES...	2026-09-29
CVE-2026-100771	⚠️ high	8.1	0.3	Undefined behavior in the DOM: Streams component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Th...	2026-09-29

These CVEs affect the same products