CVE-2026-77987 (GCVE-0-2026-77987)

Vulnerability from cvelistv5 – Published: 2026-09-22 20:43 – Updated: 2026-09-23 15:26
VLAI
Title
GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery
Summary
A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to internal services listening on other ports of the same appliance. Response bodies were not returned to the requester, but response timing acted as an oracle that allowed instance secrets to be extracted character by character. An extracted secret could then be used in a separate interaction with an internal service to obtain remote code execution on the appliance. Exploitation required network access to the instance and was unauthenticated when private mode was disabled, or required any authenticated user when private mode was enabled. This vulnerability affected GitHub Enterprise Server versions 3.17 through 3.22 and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported through the GitHub Bug Bounty program.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 15:26 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
  • CWE-208 - Observable Timing Discrepancy
Impacted products
Vendor Product Version CPE status
GitHub Enterprise Server Affected: 3.17.0 , < 3.17.* (semver)
Affected: 3.18.0 , < 3.18.* (semver)
Affected: 3.19.0 , < 3.19.* (semver)
Affected: 3.20.0 , < 3.20.* (semver)
Affected: 3.21.0 , < 3.21.* (semver)
Affected: 3.22.0 , < 3.22.* (semver)
guessed Create a notification for this product.
Show details on NVD website

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                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-918",
                  "description": "CWE-918 Server-Side Request Forgery (SSRF)",
                  "lang": "en",
                  "type": "CWE"
                },
                {
                  "cweId": "CWE-208",
                  "description": "CWE-208 Observable Timing Discrepancy",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-22T20:43:53.715Z",
            "orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
            "shortName": "GitHub_P"
          },
          "references": [
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.21"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.15"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.12"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.8"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.6"
            },
            {
              "tags": [
                "release-notes"
              ],
              "url": "https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.1"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
        "assignerShortName": "GitHub_P",
        "cveId": "CVE-2026-77987",
        "datePublished": "2026-09-22T20:43:53.715Z",
        "dateReserved": "2026-08-21T18:51:48.052Z",
        "dateUpdated": "2026-09-23T15:26:58.923Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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