Medium 5.4Published Aug 18, 2026

CVE-2026-74974Same-origin policy bypass in the Graphics: ImageLib component

Updated under an hour ago (Oct 27, 2026, 6:23 PM ET)

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It affects Mozilla Firefox and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVSS: 5.4 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mozilla
NVD analysis: Analyzed
Record last updated: Aug 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mozilla Firefox mozilla:firefox (from the name)	115.39 builds before 115.* not affected; 140.14 builds before 140.* not affected; 153.1 builds before 153.* not affected; from 154 not affected	CNA record
Mozilla Thunderbird mozilla:thunderbird (from the name)	140.14 builds before 140.* not affected; 153.1 builds before 153.* not affected; from 154 not affected	CNA record
mozilla firefox mozilla:firefox	before 115.39.0; from 116.0 before 140.14.0; from 141.0 before 153.1.0	NVD
mozilla thunderbird mozilla:thunderbird	before 140.14.0; from 141.0 before 153.1.0	NVD

References

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2061794	permissions-required
https://www.mozilla.org/security/advisories/mfsa2026-74/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-75/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-76/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-77/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-78/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-79/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-80/	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.