CVE-2019-11723: Mozilla Firefox vulnerability

CVE-2019-11723: A vulnerability exists during the installation of add-ons where the initial fetch ignored the origin attrib...

A vulnerability exists during the installation of add-ons where the initial fetch ignored the origin attributes of the browsing context. This could leak cookies in private browsing mode or across different "containers" for people who use the Firefox Multi-Account Containers Web Extension. This vulnerability affects Firefox < 68.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 23:03 UTC (UTC+00:00)

Security readout for executives and security teams

Firefox versions before 68 could mishandle add-on installation requests so cookies from private browsing or separate Firefox containers could be exposed across boundaries. This is a privacy and session-isolation issue, not described in the sources as remote code execution. Exposure is mainly legacy Firefox installations below version 68, including downstream Linux packages that had separate advisories. Risk is more relevant where private browsing or Firefox Multi-Account Containers were used for separation of sensitive identities or sessions. Treat this as a moderate privacy-risk cleanup item. It is most important for environments where browser session separation protects sensitive accounts, investigations, client data, or regulated activity. Mitigation focus: Update Firefox to version 68 or a current supported release.; Apply relevant Gentoo or openSUSE security updates where those packages are used.; Remove or isolate unsupported Firefox builds below version 68..

Prepared: Jun 6, 2026, 20:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jul 23, 2019, 13:17 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.mozilla.org/security/advisories/mfsa2019-21/CVE reference · x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1528335CVE reference · x_refsource_MISC
GLSA-201908-12CVE reference · vendor-advisory, x_refsource_GENTOO

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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