EUVD-2026-43045Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable link injection with low complexity; PR:N reflects the unauthenticated select-account vector, UI:R for the required click, high C/I as script acts with victim's API rights, no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Stored and reflected cross-site scripting in Grist (grist-core) before 1.7.15 lets an attacker place a javascript: URL into an unvalidated link href and execute script in a victim's authenticated Grist origin on a single click. Two entry points are affected: the /welcome/select-account page reflects its next query parameter into account-button links, and the GristDocTour table's Link_URL column renders as a clickable tour button, so a document editor can plant a payload that runs when another user opens the document. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires victim interaction - the target must click a poisoned link (an account button on /welcome/select-account whose next parameter was attacker-supplied, or a document-tour button whose GristDocTour Link_URL contains a javascript: URI). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 base score is 8.5 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N) - network-reachable, low complexity, but requiring user interaction (a click). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with editor access to a shared Grist document adds a document tour and sets the GristDocTour Link_URL to a javascript: payload; when a colleague opens the document and clicks the tour link, the script runs in their authenticated session and calls Grist APIs to grant the attacker owner-level access. Alternatively, the attacker sends a victim a crafted /welcome/select-account URL whose next parameter carries a javascript: payload, executing when the victim clicks an account button. … |
| Remediation | Vendor-released patch: upgrade to Grist grist-core version 1.7.15 or later, which adds URL scheme validation to both link sinks (fix commit 5d0a90a162b5125fce7e8a86fb137eee5199dbde, release https://github.com/gristlabs/grist-core/releases/tag/v1.7.15, advisory https://github.com/gristlabs/grist-core/security/advisories/GHSA-7f6v-vghq-34xq). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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