Vulnerability details

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.

• https://github.com/gristlabs/grist-core/security/advisories/GHSA-7f6v-vghq-34xq x_refsource_CONFIRM
• https://github.com/gristlabs/grist-core/commit/5d0a90a162b5125fce7e8a86fb137eee5199dbde x_refsource_MISC
• https://github.com/gristlabs/grist-core/releases/tag/v1.7.15 x_refsource_MISC