CVE-2026-87719 (GCVE-0-2026-87719)
Vulnerability from cvelistv5 – Published: 2026-09-12 02:46 – Updated: 2026-09-15 03:55
VLAI
EPSS
VEX
Title
Deserialization of Untrusted Data in GitLab
Summary
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
Severity
9.9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 00:00 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://gitlab.com/gitlab-org/gitlab/-/work_items… | |
| https://hackerone.com/reports/4012289 | technical-descriptionexploitpermissions-required |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-87719",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-14T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T03:55:59.728Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"product": "GitLab",
"repo": "git://git@gitlab.com:gitlab-org/gitlab.git",
"vendor": "GitLab",
"versions": [
{
"lessThan": "19.1.8",
"status": "affected",
"version": "18.3",
"versionType": "semver"
},
{
"lessThan": "19.2.6",
"status": "affected",
"version": "19.2",
"versionType": "semver"
},
{
"lessThan": "19.3.2",
"status": "affected",
"version": "19.3",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Thanks [kyyblin](https://hackerone.com/kyyblin) for reporting this vulnerability through our HackerOne bug bounty program"
}
],
"descriptions": [
{
"lang": "en",
"value": "GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502: Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-12T02:46:26.755Z",
"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"shortName": "GitLab"
},
"references": [
{
"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/628160"
},
{
"name": "HackerOne Bug Bounty Report #4012289",
"tags": [
"technical-description",
"exploit",
"permissions-required"
],
"url": "https://hackerone.com/reports/4012289"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to versions 19.1.8, 19.2.6, 19.3.2 or above."
}
],
"title": "Deserialization of Untrusted Data in GitLab"
}
},
"cveMetadata": {
"assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
"assignerShortName": "GitLab",
"cveId": "CVE-2026-87719",
"datePublished": "2026-09-12T02:46:26.755Z",
"dateReserved": "2026-09-09T00:34:03.671Z",
"dateUpdated": "2026-09-15T03:55:59.728Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-87719",
"date": "2026-09-14",
"epss": "0.00612",
"percentile": "0.4744"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-87719\",\"sourceIdentifier\":\"cve@gitlab.com\",\"published\":\"2026-09-12T03:16:31.477\",\"lastModified\":\"2026-09-15T04:18:19.173\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.\"}],\"affected\":[{\"source\":\"cve@gitlab.com\",\"affectedData\":[{\"vendor\":\"GitLab\",\"product\":\"GitLab\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*\"],\"repo\":\"git://git@gitlab.com:gitlab-org/gitlab.git\",\"versions\":[{\"version\":\"18.3\",\"lessThan\":\"19.1.8\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"19.2\",\"lessThan\":\"19.2.6\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"19.3\",\"lessThan\":\"19.3.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.9,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.1,\"impactScore\":6.0}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-14T00:00:00+00:00\",\"id\":\"CVE-2026-87719\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"cve@gitlab.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"references\":[{\"url\":\"https://gitlab.com/gitlab-org/gitlab/-/work_items/628160\",\"source\":\"cve@gitlab.com\"},{\"url\":\"https://hackerone.com/reports/4012289\",\"source\":\"cve@gitlab.com\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-87719\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-14T12:53:28.292076Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-14T12:57:10.888Z\"}}], \"cna\": {\"title\": \"Deserialization of Untrusted Data in GitLab\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Thanks [kyyblin](https://hackerone.com/kyyblin) for reporting this vulnerability through our HackerOne bug bounty program\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 9.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*\"], \"repo\": \"git://git@gitlab.com:gitlab-org/gitlab.git\", \"vendor\": \"GitLab\", \"product\": \"GitLab\", \"versions\": [{\"status\": \"affected\", \"version\": \"18.3\", \"lessThan\": \"19.1.8\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"19.2\", \"lessThan\": \"19.2.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"19.3\", \"lessThan\": \"19.3.2\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to versions 19.1.8, 19.2.6, 19.3.2 or above.\"}], \"references\": [{\"url\": \"https://gitlab.com/gitlab-org/gitlab/-/work_items/628160\"}, {\"url\": \"https://hackerone.com/reports/4012289\", \"name\": \"HackerOne Bug Bounty Report #4012289\", \"tags\": [\"technical-description\", \"exploit\", \"permissions-required\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-502\", \"description\": \"CWE-502: Deserialization of Untrusted Data\"}]}], \"providerMetadata\": {\"orgId\": \"ceab7361-8a18-47b1-92ba-4d7d25f6715a\", \"shortName\": \"GitLab\", \"dateUpdated\": \"2026-09-12T02:46:26.755Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-87719\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T03:55:59.728Z\", \"dateReserved\": \"2026-09-09T00:34:03.671Z\", \"assignerOrgId\": \"ceab7361-8a18-47b1-92ba-4d7d25f6715a\", \"datePublished\": \"2026-09-12T02:46:26.755Z\", \"assignerShortName\": \"GitLab\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Loading…
Loading…