Medium 4.7Published Aug 3, 2026

CVE-2026-18738Shlink CSV Formula Injection via Visit Export CLI

Updated under an hour ago (2026-10-19 09:20 UTC)

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It affects shlinkio Shlink. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Shlink versions 5.0.0 through 5.1.5 contain a CSV formula injection vulnerability that allows unauthenticated remote attackers to plant spreadsheet formulas into exported visit data by supplying malicious values in User-Agent, Referer, or request path headers beginning with formula-triggering characters such as =, +, -, or @. Attackers can craft a single unauthenticated request against any short URL to embed DDE or WEBSERVICE formula payloads into CSV cells, which are then executed on an administrator's client machine when the exported CSV file is opened in a spreadsheet application that evaluates formulas.

CVSS: 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Weakness (CWE): CWE-1236
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Aug 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

shlinkio Shlink shlinkio:shlink (from the name)	from 5.0.0 through 5.1.5	CNA record

References

https://github.com/theopaid/CSV-formula-injection-in-visit-exports-shlink-vendor-advisory
https://github.com/shlinkio/shlinkproduct
https://www.vulncheck.com/advisories/shlink-csv-formula-injection-via-visit-export-clithird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.