News · Mozilla Foundation Security Advisories

• Mozilla Foundation Security Advisories Tue 27 Oct

  MFSA 2026-118: Security Vulnerabilities fixed in Firefox 159

  Impact high. Firefox 159.
• Mozilla Foundation Security Advisories Tue 27 Oct

  MFSA 2026-119: Security Vulnerabilities fixed in Firefox ESR 115.44

  Impact high. Firefox ESR 115.44.
• Mozilla Foundation Security Advisories Tue 27 Oct

  MFSA 2026-120: Security Vulnerabilities fixed in Firefox ESR 153.6

  Impact high. Firefox ESR 153.6.
• Mozilla Foundation Security Advisories Tue 27 Oct

  MFSA 2026-121: Security Vulnerabilities fixed in Thunderbird 159

  Impact high. Thunderbird 159.
• Mozilla Foundation Security Advisories Tue 27 Oct

  MFSA 2026-122: Security Vulnerabilities fixed in Thunderbird 153.6

  Impact high. Thunderbird 153.6.
• Mozilla Foundation Security Advisories Mon 26 Oct

  MFSA 2026-117: Security Vulnerabilities fixed in Firefox for iOS 156.1

  Impact moderate. Firefox for iOS 156.1.
• Mozilla Foundation Security Advisories 21 Oct

  MFSA 2026-116: Security Vulnerabilities fixed in Firefox for Android 158.0.2

  Impact high. Firefox for Android 158.0.2.
• Mozilla Foundation Security Advisories 20 Oct

  MFSA 2026-111: Security Vulnerabilities fixed in Firefox 158.0.1

  Impact high. Firefox 158.0.1.
• Mozilla Foundation Security Advisories 20 Oct

  MFSA 2026-112: Security Vulnerabilities fixed in Firefox ESR 153.5.1

  Impact high. Firefox ESR 153.5.1.
• Mozilla Foundation Security Advisories 20 Oct

  MFSA 2026-113: Security Vulnerabilities fixed in Firefox ESR 115.43.1

  Impact high. Firefox ESR 115.43.1.
• Mozilla Foundation Security Advisories 20 Oct

  MFSA 2026-114: Security Vulnerabilities fixed in Thunderbird 158.0.1

  Impact high. Thunderbird 158.0.1.
• Mozilla Foundation Security Advisories 20 Oct

  MFSA 2026-115: Security Vulnerabilities fixed in Thunderbird 153.5.1

  Impact high. Thunderbird 153.5.1.
• Mozilla Foundation Security Advisories 13 Oct

  MFSA 2026-106: Security Vulnerabilities fixed in Firefox 158

  Impact high. Firefox 158.
• Mozilla Foundation Security Advisories 13 Oct

  MFSA 2026-107: Security Vulnerabilities fixed in Firefox ESR 115.43

  Impact high. Firefox ESR 115.43.
• Mozilla Foundation Security Advisories 13 Oct

  MFSA 2026-108: Security Vulnerabilities fixed in Firefox ESR 153.5

  Impact high. Firefox ESR 153.5.
• Mozilla Foundation Security Advisories 13 Oct

  MFSA 2026-109: Security Vulnerabilities fixed in Thunderbird 158

  Impact high. Thunderbird 158.
• Mozilla Foundation Security Advisories 13 Oct

  MFSA 2026-110: Security Vulnerabilities fixed in Thunderbird 153.5

  Impact high. Thunderbird 153.5.
• Mozilla Foundation Security Advisories 30 Sep

  MFSA 2026-101: Security Vulnerabilities fixed in Thunderbird 157

  Impact high. Thunderbird 157.
• Mozilla Foundation Security Advisories 30 Sep

  MFSA 2026-102: Security Vulnerabilities fixed in Thunderbird 140.17

  Impact high. Thunderbird 140.17.
• Mozilla Foundation Security Advisories 30 Sep

  MFSA 2026-103: Security Vulnerabilities fixed in Thunderbird 153.4

  Impact high. Thunderbird 153.4.
• Mozilla Foundation Security Advisories 29 Sep

  MFSA 2026-97: Security Vulnerabilities fixed in Firefox 157

  Impact high. Firefox 157.
• Mozilla Foundation Security Advisories 29 Sep

  MFSA 2026-98: Security Vulnerabilities fixed in Firefox ESR 115.42

  Impact high. Firefox ESR 115.42.
• Mozilla Foundation Security Advisories 29 Sep

  MFSA 2026-99: Security Vulnerabilities fixed in Firefox ESR 140.17

  Impact high. Firefox ESR 140.17.
• Mozilla Foundation Security Advisories 29 Sep

  MFSA 2026-100: Security Vulnerabilities fixed in Firefox ESR 153.4

  Impact high. Firefox ESR 153.4.
• Mozilla Foundation Security Advisories 16 Sep

  MFSA 2026-96: Security Vulnerabilities fixed in Thunderbird 153.3

  Impact high. Thunderbird 153.3.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-90: Security Vulnerabilities fixed in Firefox 156

  Impact high. Firefox 156.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-91: Security Vulnerabilities fixed in Firefox ESR 115.41

  Impact high. Firefox ESR 115.41.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-92: Security Vulnerabilities fixed in Firefox ESR 140.16

  Impact high. Firefox ESR 140.16.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-93: Security Vulnerabilities fixed in Firefox ESR 153.3

  Impact high. Firefox ESR 153.3.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-94: Security Vulnerabilities fixed in Thunderbird 156

  Impact high. Thunderbird 156.
• Mozilla Foundation Security Advisories 15 Sep

  MFSA 2026-95: Security Vulnerabilities fixed in Thunderbird 140.16

  Impact high. Thunderbird 140.16.
• Mozilla Foundation Security Advisories 31 Aug

  MFSA 2026-81: Security Vulnerabilities fixed in Firefox for iOS 155.0

  Impact moderate. Firefox for iOS 155.0.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-74: Security Vulnerabilities fixed in Firefox 154

  Impact high. Firefox 154.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-75: Security Vulnerabilities fixed in Firefox ESR 115.39

  Impact high. Firefox ESR 115.39.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-76: Security Vulnerabilities fixed in Firefox ESR 140.14

  Impact high. Firefox ESR 140.14.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-77: Security Vulnerabilities fixed in Firefox ESR 153.1

  Impact high. Firefox ESR 153.1.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-78: Security Vulnerabilities fixed in Thunderbird 154

  Impact high. Thunderbird 154.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-79: Security Vulnerabilities fixed in Thunderbird 140.14

  Impact high. Thunderbird 140.14.
• Mozilla Foundation Security Advisories 18 Aug

  MFSA 2026-80: Security Vulnerabilities fixed in Thunderbird 153.1

  Impact high. Thunderbird 153.1.
• Mozilla Foundation Security Advisories 21 Jul

  MFSA 2026-68: Security Vulnerabilities fixed in Firefox 153

  Impact high. Firefox 153.
• Mozilla Foundation Security Advisories 21 Jul

  MFSA 2026-69: Security Vulnerabilities fixed in Firefox ESR 115.38

  Impact critical. Firefox ESR 115.38.
• Mozilla Foundation Security Advisories 21 Jul

  MFSA 2026-70: Security Vulnerabilities fixed in Firefox ESR 140.13

  Impact critical. Firefox ESR 140.13.
• Mozilla Foundation Security Advisories 21 Jul

  MFSA 2026-71: Security Vulnerabilities fixed in Thunderbird 153

  Impact high. Thunderbird 153.
• Mozilla Foundation Security Advisories 21 Jul

  MFSA 2026-72: Security Vulnerabilities fixed in Thunderbird 140.13

  Impact critical. Thunderbird 140.13.
• Mozilla Foundation Security Advisories 14 Jul

  MFSA 2026-67: Security Vulnerabilities fixed in Firefox 152.0.6

  Impact critical. Firefox 152.0.6.
• Mozilla Foundation Security Advisories 13 Jul

  MFSA 2026-66: Security Vulnerabilities fixed in Firefox for iOS 152.4

  Impact low. Firefox for iOS 152.4.
• Mozilla Foundation Security Advisories 30 Jun

  MFSA 2026-62: Security Vulnerabilities fixed in Firefox 152.0.4

  Impact high. Firefox 152.0.4.
• Mozilla Foundation Security Advisories 30 Jun

  MFSA 2026-63: Security Vulnerabilities fixed in Thunderbird 152.0.1

  Impact high. Thunderbird 152.0.1.
• Mozilla Foundation Security Advisories 30 Jun

  MFSA 2026-64: Security Vulnerabilities fixed in Thunderbird 140.12.1

  Impact high. Thunderbird 140.12.1.
• Mozilla Foundation Security Advisories 16 Jun

  MFSA 2026-56: Security Vulnerabilities fixed in Firefox for iOS 152.0

  Impact high. Firefox for iOS 152.0.

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