CVE-2026-7323Network attack vector

Remote code execution

Published Apr 28, 2026 · Updated Apr 28, 2026

Memory safety errors in Firefox ESR and Thunderbird ESR 140.10.0 and Firefox and Thunderbird 150.0.0 allow remote attackers to execute code. The grouped advisory reports memory corruption but does not disclose the affected routines, unsafe input operations, or trigger conditions. Reachability requires processing attacker-controlled browser-like content; Thunderbird disables scripting while reading mail, limiting ordinary email exposure.

CVSS severity7.3
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory safety errors in Firefox ESR and Thunderbird ESR 140.10.0 and Firefox and Thunderbird 150.0.0 allow remote attackers to execute code. The grouped advisory reports memory corruption but does not disclose the affected routines, unsafe input operations, or trigger conditions. Reachability requires processing attacker-controlled browser-like content; Thunderbird disables scripting while reading mail, limiting ordinary email exposure.

The record

CVE
CVE-2026-7323
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5redhat-SADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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