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CVE-2025-6429

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:686cb41a56d5bedee796d79aa73dd689a77a26ae218f4a77c065cb1dce9937ac
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"128.*","status":"unaffected","version":"128.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/affected/1

{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"128.*","status":"unaffected","version":"128.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"128.*","status":"unaffected","version":"128.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/affected/1
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"128.*","status":"unaffected","version":"128.12","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-116","description":"CWE-116 Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

7 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1970658"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/adp/1/references/1
{"url":"https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/adp/1/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-51/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-53/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/references/2
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-54/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/references/3
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-55/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e343871ed8a048b78874a04a13dd3228bc56952cd6bc60f21c74090376561d4 · sha256:14dd714aa919dd9b… · /containers/cna/references/4

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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