{"schemaVersion":3,"id":"CVE-2022-26387","aliases":["UBUNTU-CVE-2022-26387","DEBIAN-CVE-2022-26387"],"status":"published","duplicateOf":null,"title":null,"description":"When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would not have noticed. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.","dates":{"published":"2022-12-22T00:00:00.000Z","modified":"2025-04-15T20:10:42.269Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":4.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":4.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00649,"percentile":0.50174,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-0.008000000000000021,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00657},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00649,"percentile":0.50174}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00657,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00649,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00649,"percentile":0.50174}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_9A91208F2F70CCFD","name":"Exploit Reference (bugzilla.mozilla.org)","source":"reference","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1752979","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-367","name":"Time-of-check Time-of-use (TOCTOU) Race Condition","description":"The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/367.html"}],"affected":[{"vendor":"debian","product":"firefox-esr","name":"firefox-esr","label":"firefox-esr","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/firefox-esr","purlType":"deb","versions":[{"text":"< 91.7.0esr-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 91.7.0esr-1","eol":null,"hubHref":null},{"vendor":"debian","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/thunderbird","purlType":"deb","versions":[{"text":"< 1:91.7.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:91.7.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"firefox","name":"firefox","label":"firefox","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/firefox","purlType":"deb","versions":[{"text":"< 98.0+build3-0ubuntu0.18.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 98.0+build3-0ubuntu0.20.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:1snap1-0ubuntu1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 98.0+build3-0ubuntu0.18.04.2 | < 98.0+build3-0ubuntu0.20.04.2 | < 1:1snap1-0ubuntu1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs38","name":"mozjs38","label":"mozjs38","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs38","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs52","name":"mozjs52","label":"mozjs52","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs52","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs68","name":"mozjs68","label":"mozjs68","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs68","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs78","name":"mozjs78","label":"mozjs78","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs78","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/thunderbird","purlType":"deb","versions":[{"text":"< 1:91.7.0+build2-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:91.7.0+build2-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:91.7.0+build2-0ubuntu1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:91.7.0+build2-0ubuntu0.18.04.1 | < 1:91.7.0+build2-0ubuntu0.20.04.1 | < 1:91.7.0+build2-0ubuntu1","eol":null,"hubHref":null},{"vendor":"mozilla","product":"firefox","name":"firefox","label":"firefox","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 98","noFixRecorded":false,"fixedIn":null},{"text":"< 98.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 98 | < 98.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"firefox","label":"Firefox","category":"app"}},"hubHref":"/vendor/mozilla/firefox"},{"vendor":"mozilla","product":"firefox_esr","name":"firefox esr","label":"firefox_esr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 91.7","noFixRecorded":false,"fixedIn":null},{"text":"< 91.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 91.7 | < 91.7","eol":null,"hubHref":"/vendor/mozilla/firefox_esr"},{"vendor":"mozilla","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 91.7","noFixRecorded":false,"fixedIn":null},{"text":"< 91.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 91.7 | < 91.7","eol":null,"hubHref":"/vendor/mozilla/thunderbird"}],"affectedCount":11,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2022-12/","label":"www.mozilla.org/security/advisories/mfsa2022-12/","hostname":"www.mozilla.org","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2022-10/","label":"www.mozilla.org/security/advisories/mfsa2022-10/","hostname":"www.mozilla.org","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2022-11/","label":"www.mozilla.org/security/advisories/mfsa2022-11/","hostname":"www.mozilla.org","tags":["Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1752979","label":"bugzilla.mozilla.org/show_bug.cgi?id=1752979","hostname":"bugzilla.mozilla.org","tags":["Exploit","Issue Tracking","Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2022-26387","label":"ubuntu.com/security/CVE-2022-26387","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2022-10/#CVE-2022-26387","label":"www.mozilla.org/en-US/security/advisories/mfsa2022-10/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2022-11/#CVE-2022-26387","label":"www.mozilla.org/en-US/security/advisories/mfsa2022-11/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-5321-1","label":"ubuntu.com/security/notices/USN-5321-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-5345-1","label":"ubuntu.com/security/notices/USN-5345-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-5321-2","label":"ubuntu.com/security/notices/USN-5321-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-26387","label":"www.cve.org/CVERecord?id=CVE-2022-26387","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2022-26387","label":"security-tracker.debian.org/tracker/CVE-2022-26387","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2942-1","DLA-2961-1","DSA-5097-1","DSA-5106-1","MGASA-2022-0093","MGASA-2022-0097","OPENSUSE-SU-2022:0821-1","OPENSUSE-SU-2022:0906-1","OPENSUSE-SU-2024:11908-1","OPENSUSE-SU-2024:11909-1","OPENSUSE-SU-2024:14572-1","RHSA-2022:0815","RHSA-2022:0816","RHSA-2022:0817","RHSA-2022:0818","RHSA-2022:0824","RHSA-2022:0843","RHSA-2022:0845","RHSA-2022:0847","RHSA-2022:0850","RHSA-2022:0853","SUSE-SU-2022:0819-1","SUSE-SU-2022:0821-1","SUSE-SU-2022:0822-1","SUSE-SU-2022:0906-1","SUSE-SU-2022:14906-1","USN-5321-1","USN-5321-2","USN-5345-1"],"duplicates":[],"related":["OPENSUSE-SU-2022:0821-1","OPENSUSE-SU-2022:0906-1","OPENSUSE-SU-2024:11908-1","OPENSUSE-SU-2024:11909-1","OPENSUSE-SU-2024:14572-1","SUSE-SU-2022:0819-1","SUSE-SU-2022:0821-1","SUSE-SU-2022:0822-1","SUSE-SU-2022:0906-1","SUSE-SU-2022:14906-1","USN-5321-1","USN-5321-2","USN-5345-1"]},"timeline":[{"kind":"published","date":"2022-12-22T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-04-15T20:10:42.269Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":40,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T17:21:41.548Z","stale":false,"partial":false}}