CVE-2018-6654

8.8 highEPSS 0.5%

High (8.8) in grammarly grammarly. EPSS 0.5% chance of exploitation in the next 30 days.

The Grammarly extension before 2018-02-02 for Chrome allows remote attackers to discover authentication tokens via an 'action: "user"' request to iframe.gr_-ifr, because the exposure of these tokens is not restricted to any specific web site.

Severity

CVSS 3.0

8.8 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-346
Published: 2018-02-06
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

grammarly:grammarly

References

https://bugs.chromium.org/p/project-zero/issues/detail?id=1527
https://bugs.chromium.org/p/project-zero/issues/detail?id=1527

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