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CVE-2026-5921

A server-side request forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to extract sensitive environment variables from the instance through a timing side-channel attack against the notebook rendering service. When private mode was disabled, the notebook viewer followed HTTP redirects without revalidating the destination host, enabling an unauthenticated SSRF to internal services. By chaining this with regex filter queries against an internal API an
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ffb113026bc482b1d8eb8bd1ec223b59fda821bffcdeef704a9a9e67f1d2bc61
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Enterprise Server","vendor":"GitHub","versions":[{"changes":[{"at":"3.14.26","status":"unaffected"}],"lessThan":"3.14.26","status":"affected","version":"3.14.0","versionType":"semver"},{"changes":[{"at":"3.15.21","status":"unaffected"}],"lessThan":"3.15.21","status":"affected","version":"3.15.0","versionType":"semver"},{"changes":[{"at":"3.16.17","status":"unaffected"}],"lessThan":"3.16.17","status":"affected","version":"3.16.0","versionType":"semver"},{"changes":[{"at":"3.17.14","status":"unaffected"}],"lessThan":"3.17.14","status":"affected","version":"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentiali…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"CWE-918 Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/0
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/1
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/2
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/3
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/4
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/5
{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:469cfa1e63b56d6265629b5ac5866aca821a79ae8def4730b2fc3e0651508747 · sha256:a13dea3a55548ed2… · /containers/cna/references/6

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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