CVE-2026-12289VulnerabilityPublished 29 Jun 2026Updated 10 Nov 2026

SUSE · Security update for MozillaThunderbird

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-12289· High 8.8

Not known to be exploited · CVSS 8.8 High · patch available : patch SUSE soon.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score

8.8High

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
SUSE Product Security Team SUSE	Affected <152	Fixed in 152

Description

This update for MozillaThunderbird fixes the following issues: Changes in MozillaThunderbird: - Mozilla Thunderbird 140.12.0 ESR MFSA 2026-61 (bsc#1268071) * CVE-2026-12289 (bmo#2023443) Privilege escalation in the Graphics: WebRender component * CVE-2026-12290 (bmo#2024852) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12291 (bmo#2036929) Use-after-free in the Networking: HTTP component * CVE-2026-12292 (bmo#2038465) Incorrect boundary conditions in the Web Audio component * CVE-2026-12294 (bmo#2039873) Sandbox escape in the DOM: Workers component * CVE-2026-12295 (bmo#2040160) Sandbox escape in the DOM: Navigation component * CVE-2026-12298 (bmo#2041981) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12296 (bmo#2040515) Sandbox escape in the Security: Process Sandboxing component * CVE-2026-12297 (bmo#2041610) Sandbox escape due to incorrect boundary conditions in the Networking component * CVE-2026-12299 (bmo#2043139) JIT miscompilation in the DOM: Core & HTML component * CVE-2026-12329 (bmo#2044738) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12302 (bmo#2034489) Mitigation bypass in the DOM: Security component * CVE-2026-12304 (bmo#2034944) Same-origin policy bypass in the Networking: Cookies component * CVE-2026-12305 (bmo#2037290) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12306 (bmo#2037323) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12307 (bmo#2038133) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12308 (bmo#2038302) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12309 (bmo#2038476) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12310 (bmo#2039707) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12311 (bmo#2040177) Information disclosure, sandbox escape in the Security: Process Sandboxing component * CVE-2026-12312 (bmo#2040383) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12313 (bmo#2040477) Information disclosure, sandbox escape in the Security: Process Sandboxing component * CVE-2026-12314 (bmo#2041856) Memory safety bug fixed in Thunderbird ESR 140.12 * CVE-2026-12315 (bmo#2042058) Mitigation bypass in the DOM: Security component * CVE-2026-12330 (bmo#2029326) Incorrect boundary conditions in the Internationalization component * CVE-2026-12324 (bmo#2038444) Incorrect boundary conditions in the Graphics: CanvasWebGL component * CVE-2026-12325 (bmo#2039443) Denial-of-service in the Graphics: ImageLib component * CVE-2026-12327 (bmo#2011842, bmo#2023902, bmo#2025512, bmo#2027312, bmo#2029444, bmo#2036571, bmo#2036900, bmo#2036936, bmo#2037995, bmo#2038551, bmo#2040717, bmo#2042724) Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 * CVE-2026-12328 (bmo#2029402, bmo#2038477, bmo#2039726, bmo#2041373, bmo#2042268, bmo#2042451, bmo#2042782, bmo#2042858, bmo#2042929, bmo#2042965, bmo#2043213) Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 - Mozilla Thunderbird 140.11.0 ESR MFSA 2026-51 (bsc#1265212) * CVE-2026-8946 (bmo#2029070) Incorrect boundary conditions in the Audio/Video: Web Codecs component * CVE-2026-8388 (bmo#2036978) Incorrect boundary conditions in the JavaScript Engine: JIT component * CVE-2026-8947 (bmo#2038439) Use-after-free in the DOM: Bindings (WebIDL) component * CVE-2026-8391 (bmo#2038575) Other issue in the JavaScript Engine component * CVE-2026-8401 (bmo#2038679) Sandbox escape in the Profile Backup component * CVE-2026-8949 (bmo#1355639) Integer overflow in the Widget: Win32 component * CVE-2026-8950 (bmo#1965430) Same-origin policy bypass in the Networking: HTTP component * CVE-2026-8953 (bmo#2029511) Sandbox escape due to use-after-free in the Disability Access APIs component * CVE-2026-8954 (bmo#2030747) Incorrect boundary conditions, integer overflow in the Audio/Video component * CVE-2026-8955 (bmo#2031064) Privilege escalation in the DOM: Workers component * CVE-2026-8956 (bmo#2032427) Integer overflow in the Networking: JAR component * CVE-2026-8957 (bmo#2033850) Privilege escalation in the Enterprise Policies component * CVE-2026-8958 (bmo#2034713) Information disclosure, sandbox escape in the Security: Process Sandboxing component * CVE-2026-8959 (bmo#2034754) Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component * CVE-2026-8961 (bmo#1962625) Spoofing issue in the Form Autofill component * CVE-2026-8962 (bmo#2004804) Mitigation bypass in the DOM: Security component * CVE-2026-8968 (bmo#2030467) Denial-of-service due to

GCVE source: db.gcve.eu
Csaf Category: csaf_security_advisory
Csaf Version: 2.0
Publisher: SUSE Product Security Team
Advisory ID: openSUSE-SU-2026:21168-1
Vendor Severity: critical
CVE Count: 56
Additional Cves: CVE-2026-12290, CVE-2026-12291, CVE-2026-12292, CVE-2026-12294, CVE-2026-12295, CVE-2026-12296, CVE-2026-12297, CVE-2026-12298, CVE-2026-12299, CVE-2026-12302, CVE-2026-12304, CVE-2026-12305, CVE-2026-12306, CVE-2026-12307, CVE-2026-12308, CVE-2026-12309, CVE-2026-12310, CVE-2026-12311, CVE-2026-12312, CVE-2026-12313, CVE-2026-12314, CVE-2026-12315, CVE-2026-12324, CVE-2026-12325, CVE-2026-12327, CVE-2026-12328, CVE-2026-12329, CVE-2026-12330, CVE-2026-7320, CVE-2026-7321, CVE-2026-7322, CVE-2026-7323, CVE-2026-8090, CVE-2026-8092, CVE-2026-8094, CVE-2026-8388, CVE-2026-8391, CVE-2026-8401, CVE-2026-8946, CVE-2026-8947, CVE-2026-8949, CVE-2026-8950, CVE-2026-8953, CVE-2026-8954, CVE-2026-8955, CVE-2026-8956, CVE-2026-8957, CVE-2026-8958, CVE-2026-8959, CVE-2026-8961, CVE-2026-8962, CVE-2026-8968, CVE-2026-8970, CVE-2026-8974, CVE-2026-8975

References

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