Is CVE-2026-55659 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-55659 being exploited in the wild.

How severe is CVE-2026-55659?

High severity, with a CVSS score of 7.7, published 10 July 2026.

Is there a fix for CVE-2026-55659?

A patch was published on 2026-06-10: Version 1.7.15 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-55659 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-55659?

Check whether you run Grist Labs Grist at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-55659: Grist Labs Grist XSS in server-rendered pages

CVE-2026-55659 · Severity: high · CVSS 7.7 · Published 2026-07-10

Grist is a collaborative spreadsheet platform that uses Python for formulas. A security flaw allowed malicious users with document editing permissions to inject malicious scripts into document names or descriptions. When other users, including administrators, view these documents, the script could run in their browser, allowing the attacker to steal data, modify access rules, or take over the entire document workspace.

Technologies: Grist Labs Grist. Vendors: Grist Labs.

Quick answers

Is CVE-2026-55659 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-55659 being exploited in the wild.
How severe is CVE-2026-55659?: High severity, with a CVSS score of 7.7, published 10 July 2026.
Which products and versions are affected?: Grist Labs Grist < 1.7.15.
Is there a fix for CVE-2026-55659?: A patch was published on 2026-06-10: Version 1.7.15 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-55659 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-55659?: Check whether you run Grist Labs Grist at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A cross-site scripting (XSS) vulnerability exists in Grist prior to version 1.7.15 due to improper neutralization of user-controlled input during server-side rendering. Specifically, document names and descriptions (stored) and the 'openerOrigin' OAuth2 request parameter (reflected) were embedded into inline <script> blocks without sufficient escaping. The root cause involved unsafe string interpolation where special replacement patterns (like $' and $&) were interpreted by the template engine. An attacker with 'editor' permissions can exploit this to execute arbitrary JavaScript in the context of other users' sessions. This allows for unauthorized data access, modification of sharing settings, and privilege escalation to 'owner'. The fix involves context-aware escaping using jsesc and literal string replacement.

Affected products

Grist Labs Grist < 1.7.15

Timeline

2026-06-10: patched: Version 1.7.15 released
2026-06-17: advisory: GitHub Security Advisory published
2026-07-10: disclosed: CVE published to NVD

References

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