Is CVE-2026-8948 actively exploited?

No active exploitation of CVE-2026-8948 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8948 be exploited remotely?

Yes. CVE-2026-8948 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8948?

CVE-2026-8948 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-8948

Published: May 19, 2026· Updated: May 20, 2026

9.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.7th

Official Description

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

NVD Source

Risk Analysis

This critical vulnerability in Mozilla Firefox and Thunderbird allows for a same-origin policy bypass in the DOM: Networking component. With a CVSS score of 9.1, this flaw poses a high risk, as it could enable attackers to access sensitive information across different origins. The EPSS score is currently unavailable, so the likelihood of exploitation is unknown.

No public exploit is currently known for this vulnerability. Its network attack vector and low attack complexity indicate it is remotely exploitable without user interaction.

Recommended Action

To mitigate this vulnerability, users should upgrade to Firefox 151 and Thunderbird 151. Promptly applying these updates is essential to protect against potential information disclosure.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-8948 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.