CVE-2017-5389: Mozilla Firefox vulnerability

CVE-2017-5389: WebExtensions could use the "mozAddonManager" API by modifying the CSP headers on sites with the appropriat...

WebExtensions could use the "mozAddonManager" API by modifying the CSP headers on sites with the appropriate permissions and then using host requests to redirect script loads to a malicious site. This allows a malicious extension to then install additional extensions without explicit user permission. This vulnerability affects Firefox < 51.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 14:55 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-5389 is a Firefox WebExtensions flaw where a malicious extension could bypass expected user consent and install additional extensions. The available source says it affects Firefox versions before 51. The business risk is mainly legacy browser exposure combined with untrusted or overly privileged extensions. Exposure is most likely where Firefox versions older than 51 remain in use, especially on unmanaged systems or with broad extension permissions. Modern supported Firefox deployments are unlikely to be exposed based on the provided affected-version statement. Treat this as a legacy browser and extension-governance issue. Prioritize remediation if old Firefox builds or unmanaged extensions exist, but do not treat it as actively exploited based on the supplied sources. Mitigation focus: Upgrade Firefox to version 51 or a current supported release.; Remove untrusted or unnecessary browser extensions.; Restrict extension installation through enterprise browser policy where available..

Prepared: Jun 7, 2026, 06:44 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: Jun 11, 2018, 21:00 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

3Source 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/mfsa2017-01/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1308688CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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