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CVE-2026-57963

An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:edbbf80ac7cb0384c95e8d4d29aaa5d43387801d8dd230662d9d1b67973e3ac0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.12.1","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"152.0.1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2042910"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/cna/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-63/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-64/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5daf565f0707fc9d7e7686e887b7f8ec621b85775f127bf65e1d6ac1376aa631 · sha256:5150e192382e9c41… · /containers/cna/references/2

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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