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CVE-2026-18736

Shlink contains a server-side request forgery vulnerability that allows authenticated API key holders to cause the server to issue arbitrary HTTP GET requests by supplying a crafted long URL during short URL creation with title auto-resolution enabled. Attackers can submit URLs pointing to public hosts that redirect to internal targets, including loopback addresses, link-local ranges, and cloud metadata endpoints such as 169.254.169.254, to exfiltrate internal service information via the HTML ti
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:621f47ee7b4a1c863347851f326257ced655a820cc07b29d8c2eda2a5f27152c
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":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /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":"2.6.0","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /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:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/references/1
{"name":"GitHub Security Advisory","tags":["vendor-advisory"],"url":"https://github.com/theopaid/Server-side-request-forgery-through-short-URL-title-resolution-shlink-"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/shlink-server-side-request-forgery-via-short-url-title-auto-resolution"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5dc53fcdeca8f6de7a6d895f51fecee3380fe25f04f9efd6b23bbcb5cc88724b · sha256:1e89a5895723e3fb… · /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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