CVE-2020-26413: An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL results in user email…

PriorityP348medium5.3CVSS 3.1

AVNACLPRNUINSUCLINAN

EXPLOIT

EPSS

33.77%

98.2th percentile

An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL results in user email being unexpectedly visible.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	gitlab	< gitlab 13.4.7-1 (sid)	gitlab 13.4.7-1 (sid)
gitlab	gitlab	—	—
gitlab	gitlab	>= 13.4.0 < 13.6.2	13.6.2
gitlab	gitlab_ce	—	—
gitlab	gitlab_ce_ee	—	—
gitlab	gitlab_ce_ee	—	—
gitlab	gitlab_ce_ee	—	—

Detection & IOCsextracted from sources · hover to see the quote

url/api/graphql

command{"query": "{\nusers {\nedges {\n node {\n username\n email\n avatarUrl\n status {\n emoji\n message\n messageHtml\n }\n }\n }\n }\n }", "variables": null, "operationName": null}

→Detect exploitation attempts by monitoring POST requests to /api/graphql containing the 'users' query with 'email' field enumeration
→Response body containing all three fields '"username":', '"avatarUrl":', and '"node":' together with HTTP 200 indicates successful information disclosure
→Extract leaked user emails from GraphQL response using JSON path '.data.users.edges[].node.email'
→Shodan/FOFA queries can be used to identify exposed GitLab instances as targets: search for http.title:"GitLab" or title="gitlab"

·Vulnerability affects GitLab CE/EE versions 13.4 through 13.6.2 only; versions prior to 13.4 and 13.6.3+ are not affected ↗
·The GraphQL endpoint is unauthenticated (PR:N, UI:N per CVSS), meaning no credentials are required to exploit this information disclosure
·High EPSS score (0.82145, 99.2nd percentile) indicates this CVE has a very high probability of exploitation in the wild

CVSS provenance

nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N

osv5.3MEDIUM

vendor_debian5.3MEDIUM

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