Security readout for executives and security teams
This old Mozilla Mail and Thunderbird issue can let a sender learn whether an email address is valid when the recipient opens HTML email. The impact is privacy and spam-targeting, not system takeover, based on the supplied sources. Exposure is likely limited to legacy deployments using the named Mozilla Mail versions or Thunderbird before 0.9 with HTML mail enabled. Modern supported mail clients are not identified as affected in the supplied sources. Treat this as a low-priority legacy hygiene issue unless the organization still uses affected mail clients. The main business risk is address harvesting and spam enablement, not breach-scale compromise. Mitigation focus: Identify and retire affected legacy Mozilla Mail and Thunderbird versions.; Disable HTML mail rendering where affected clients remain in use.; Block automatic remote content retrieval in email where configurable..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2004-2226 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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
- mozilla-css-obtain-emails(17949)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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