What is CVE-2026-18738?

CVE-2026-18738 is a medium-severity vulnerability in Shlinkio Shlink, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 4.7/10. Published 2026-08-03.

How severe is CVE-2026-18738?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Shlinkio Shlink

CVE-2026-18738

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…

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.

Affected products

Shlinkio Shlink — versions 5.0.0

Weakness classification (CWE)

CWE-1236 — Improper Neutralization of Formula Elements in a CSV File

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-18738?: CVE-2026-18738 is a medium-severity vulnerability in Shlinkio Shlink, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 4.7/10. Published 2026-08-03.
How severe is CVE-2026-18738?: Medium severity. CVSS v3 base score is 4.7 out of 10.