What is CVE-2026-55659?

CVE-2026-55659 is a high-severity vulnerability in Gristlabs Grist-core, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2026-07-10.

How severe is CVE-2026-55659?

High severity. CVSS v3 base score is 7.7 out of 10.

XSS in Gristlabs Grist-core

CVE-2026-55659

Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, several server-rendered Grist pages embedded user-controlled values into the page and into inline scripts without fully escaping them, allowing cross-site…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.

Affected products

Gristlabs Grist-core — versions < 1.7.15

Weakness classification (CWE)

CWE-79 — Cross-site Scripting
CWE-116 — Improper Encoding or Escaping of Output

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55659?: CVE-2026-55659 is a high-severity vulnerability in Gristlabs Grist-core, classified under Cross-site Scripting. CVSS score: 7.7/10. Published 2026-07-10.
How severe is CVE-2026-55659?: High severity. CVSS v3 base score is 7.7 out of 10.