Vulnerability · CVE-2026-8964
Spoofing issue in the Popup Blocker component.
Published May 19, 2026 · catalog updated Jul 23, 2026 · Spoofing issue in the
Check if you run it
No confirmed exploitation is on record for CVE-2026-8964. EPSS is 0.39%. Act only if a listed version of Spoofing issue in the is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Spoofing issue in the).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.39%
- Remediation
- Advisory link
- Affected products
- cpe mozilla/firefox · cpe mozilla/thunderbird
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe mozilla/firefoxversion unspecified
- cpe mozilla/thunderbirdversion unspecified
How to fix CVE-2026-8964
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-8964. EPSS is 0.39%. Act only if a listed version of Spoofing issue in the is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-451: User Interface (UI) Misrepresentation of Critical Information. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 19, 2026 · NIST NVD
Detected
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Jul 23, 2026 · NIST NVD
Updated
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Sources
- CVE.orgVulnerability recordCVE-2026-8964
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-8964
30-day exploitation probability 0.4%
first.org - NIST NVDVulnerability recordCVE-2026-8964
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.