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.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Shlink
Shlink shlink |
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| Vendors & Products |
Shlink
Shlink shlink |
Tue, 04 Aug 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Mon, 03 Aug 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
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| Description | 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. | |
| Title | Shlink CSV Formula Injection via Visit Export CLI | |
| Weaknesses | CWE-1236 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-08-03T20:53:57.661Z
Updated: 2026-08-04T15:05:04.836Z
Reserved: 2026-08-03T20:03:41.689Z
Link: CVE-2026-18738
Updated: 2026-08-04T14:28:32.852Z
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