CVE-2026-84131 (CVSS 8.8)

Description

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

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CVSS v3.1 Score

8.8

HIGH

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

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.26%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-763 CWE-763

References

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2060008 https://www.mozilla.org/security/advisories/mfsa2026-82/ https://www.mozilla.org/security/advisories/mfsa2026-83/ https://www.mozilla.org/security/advisories/mfsa2026-84/ https://www.mozilla.org/security/advisories/mfsa2026-85/ https://www.mozilla.org/security/advisories/mfsa2026-86/ https://www.mozilla.org/security/advisories/mfsa2026-87/ https://www.mozilla.org/security/advisories/mfsa2026-88/

Frequently Asked Questions

What is CVE-2026-84131? +

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-84131? +

CVE-2026-84131 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-84131? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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