Vulnerability · CVE-2026-117863
CVE-2026-117863 is listed by Security Vulnerabilities fixed in Thunderbird 153.6 — Mozilla.
Published Unknown date · Mozilla
Last checked Oct 28, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-117863. EPSS is 0.19%. Act only if a listed version of Mozilla is installed.
Gaps on this record
- 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
- Unknown—
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.19%
- Remediation
- Not established
- Affected products
- Mozilla
CVE-2026-117863 is listed by Security Vulnerabilities fixed in Thunderbird 153.6 — Mozilla.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-117863
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
No version range is stored, so an installed version cannot be checked on this page.
Advisory
Open the cve_org record and follow its fix.
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-2026-117863. EPSS is 0.19%. Act only if a listed version of Mozilla 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?
No weakness class is stored. EPSS 0.19%. 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.
Oct 27, 2026 · Mozilla Security Advisories
Detected
CVE-2026-117863 is listed by Security Vulnerabilities fixed in Thunderbird 153.6 — Mozilla.
Sources
- CVE.orgVulnerability recordCVE-2026-117863
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-117863
30-day exploitation probability 0.19%
first.org - Mozilla Security AdvisoriesVendor advisoryCVE-2026-117863
Security Vulnerabilities fixed in Thunderbird 153.6 — Mozilla
mozilla.org
Freshness
Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 28, 2026
- CVE.orgOct 27, 2026
- Mozilla Security AdvisoriesOct 27, 2026