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CVE-2026-0818

When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations,
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e6e8d75a3937e5fff2a8666f07d887eb0b583b37007e2683707db65b1030d141
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-352","description":"CWE-352 Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/1/descriptions/0

{"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:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/2/descriptions/0

{"cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"140.*","status":"unaffected","version":"140.7.1","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"147.0.1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-352","description":"CWE-352 Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/1/descriptions/0
{"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:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/2/descriptions/0
{"cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1881530"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2026/02/msg00005.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/adp/1/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-07/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2026-08/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bd47ee021e46c6c211676c9fba18bcd69404d7bba9b1154fa9746d7031176c8f · sha256:49795d1302a28f2a… · /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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