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TI-2026-15356 Aliases CVE-2026-18738GHSA-ghrv-q878-w45x

Shlink CSV Formula Injection via Visit Export CLI

Priority LOW 30CWE-1236Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00493 42nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

No affected products listed by the sources yet.

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-18738
  2. 2026-10-03 Alias added: GHSA-ghrv-q878-w45x

References

Advisory 1

Other 1

  • TI-2026-62505 Shlink through 5.1.6 Mercure Token Authorization Bypass CVSS 4.0HIGH 7.1
  • TI-2026-15355 Shlink Blind SQL Injection via tags/stats orderBy Parameter CVSS 4.0HIGH 7.1
  • TI-2026-15354 Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences