CVE-2026-18738
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 31% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1236 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-33256 | High | 8.8 | 79% | - | - |
| CVE-2018-11652 | Critical | 9.8 | 24% | - | Fix |
| CVE-2020-36962 | Critical | 9.8 | 11% | - | - |
| CVE-2019-12765 | Critical | 9.8 | 10% | - | - |
| CVE-2019-14749 | High | 8.8 | 9.6% | - | Fix |
| CVE-2020-9372 | High | 7.8 | 8.6% | - | Fix |
Common questions
How do I fix CVE-2026-18738?
No published fix for CVE-2026-18738 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-18738 being actively exploited?
Not that we know of. CVE-2026-18738 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.
How severe is CVE-2026-18738?
CVE-2026-18738 has a CVSS v3 base score of 4.7, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-04.