gristlabs grist-core up to 1.7.14 Link URL Column /welcome/select-account next/Link_URL cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in gristlabs grist-core up to 1.7.14. The impacted element is an unknown function of the file /welcome/select-account of the component Link URL Column. Performing a manipulation of the argument next/Link_URL results in cross site scripting. This vulnerability is reported as CVE-2026-55665. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in gristlabs grist-core up to 1.7.14. It has been classified as problematic. This affects an unknown functionality of the file /welcome/select-account of the component Link URL Column. The manipulation of the argument next/Link_URL with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, Grist contained two cross-site scripting vulnerabilities where an attacker-controlled value reached a link's href without scheme validation, so a javascript URL could run in a victim's Grist origin on a single click. On the account-selection page, /welcome/select-account used its next query parameter as the account buttons' link target. In document tours, the GristDocTour table's Link_URL column became a clickable button, allowing an editor of a shared document to store a javascript URL there that ran when another user opened the document and clicked the tour link. Because the script runs in the victim's authenticated session, it can call Grist APIs as the victim, reading or modifying data and changing sharing settings and access rules. A document editor could therefore escalate to owner-level access. This issue is fixed in version 1.7.15.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-55665 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 1.7.15 eliminates this vulnerability.

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Productinfo

Vendor

• gristlabs

Name

• grist-core

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14

Website

• Product: https://github.com/gristlabs/grist-core/

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