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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 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 adminis
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d1c49b1b6eee537dc344e128ad2c1f7fe3daade447d3d993967e3711a444fc38
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Shlink","vendor":"shlinkio","versions":[{"lessThanOrEqual":"5.1.5","status":"affected","version":"5.0.0","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1236","description":"Improper Neutralization of Formula Elements in a CSV File","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"Product Repository","tags":["product"],"url":"https://github.com/shlinkio/shlink"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/references/1
{"name":"GitHub Security Advisory","tags":["vendor-advisory"],"url":"https://github.com/theopaid/CSV-formula-injection-in-visit-exports-shlink-"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/shlink-csv-formula-injection-via-visit-export-cli"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1786afe3f60ba0896f390b57710c57a17b3db1de050696ec30daba30f11a5c25 · sha256:96578fdec486c23d… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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