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Fencer Intel
medium 6.5

CVE-2018-6109 json

readAsText() can indefinitely read the file picked by the user, rather than only once at the time the file is picked in File API in Google…

published 7y ago modified 4mo ago also EUVD-2018-17872

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

readAsText() can indefinitely read the file picked by the user, rather than only once at the time the file is picked in File API in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to access data on the user file system without explicit consent via a crafted HTML page.

Patch / fix

  • Google Chrome 66.0.3359.117
  • chromium-browser Ubuntu 16.04 LTS 66.0.3359.139-0ubuntu0.16.04.3
  • chromium-browser Ubuntu 18.04 LTS 66.0.3359.139-0ubuntu0.18.04.3

ubuntu advisories UBUNTU-CVE-2018-6109

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium-browser RHEL 6 EXTRAS 66.0.3359.117-1.el6_9

red hat advisories RHSA-2018:1195

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium Package Hub 12 SP2 66.0.3359.181-55.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2018:1175-1openSUSE-SU-2018:1437-1

  • chromium Arch Linux 66.0.3359.117-1

arch linux advisories AVG-678

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-6109 updated cvss 4.3

chromium-browser: Incorrect handling of files by FileAPI

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9
    fixed: vendor fix RHSA-2018:1195

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.41% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Google Chrome

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.