CVE-2017-7807
CVSS v3
8.1
HIGH
EPSS Score
2.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Technical details
- Published
- 2018-06-11
Frequently asked questions
What is CVE-2017-7807?
A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Is CVE-2017-7807 actively exploited?
Active exploitation of CVE-2017-7807 has not been confirmed. Its EPSS score was 2.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2017-7807?
CVE-2017-7807 has a CVSS v3 base score of 8.1 (HIGH severity).
Is CVE-2017-7807 affecting your environment?
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