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Vulnerability Details :

CVE-2026-1999

Summary
Assigner-GitHub_P
Assigner Org ID-82327ea3-741d-41e4-88f8-2cf9e791e760
Published At-18 Feb, 2026 | 20:44
Updated At-19 Feb, 2026 | 14:32
Rejected At-
Credits

Incorrect Authorization vulnerability was identified in GitHub Enterprise Server that allowed unauthorized merging of pull requests

An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to merge their own pull request into a repository without having push access by exploiting an authorization bypass in the enable_auto_merge mutation for pull requests. This issue only affected repositories that allow forking as the attack relies on opening a pull request from an attacker-controlled fork into the target repository. Exploitation was only possible in specific scenarios. It required a clean pull request status and only applied to branches without branch protection rules enabled. This vulnerability affected GitHub Enterprise Server versions prior to 3.19.2, 3.18.5, and 3.17.11, and was fixed in versions 3.19.2, 3.18.5, and 3.17.11. This vulnerability was reported via the GitHub Bug Bounty program.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_P
Assigner Org ID:82327ea3-741d-41e4-88f8-2cf9e791e760
Published At:18 Feb, 2026 | 20:44
Updated At:19 Feb, 2026 | 14:32
Rejected At:
▼CVE Numbering Authority (CNA)
Incorrect Authorization vulnerability was identified in GitHub Enterprise Server that allowed unauthorized merging of pull requests

An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to merge their own pull request into a repository without having push access by exploiting an authorization bypass in the enable_auto_merge mutation for pull requests. This issue only affected repositories that allow forking as the attack relies on opening a pull request from an attacker-controlled fork into the target repository. Exploitation was only possible in specific scenarios. It required a clean pull request status and only applied to branches without branch protection rules enabled. This vulnerability affected GitHub Enterprise Server versions prior to 3.19.2, 3.18.5, and 3.17.11, and was fixed in versions 3.19.2, 3.18.5, and 3.17.11. This vulnerability was reported via the GitHub Bug Bounty program.

Affected Products
Vendor
GitHub, Inc.GitHub
Product
Enterprise Server
Default Status
affected
Versions
Affected
  • From 3.17.0 before 3.17.11 (semver)
    • -> unaffectedfrom3.17.11
  • From 3.18.0 before 3.18.5 (semver)
    • -> unaffectedfrom3.18.5
  • From 3.19.0 before 3.19.2 (semver)
    • -> unaffectedfrom3.19.2
Problem Types
TypeCWE IDDescription
CWECWE-863CWE-863 Incorrect Authorization
Type: CWE
CWE ID: CWE-863
Description: CWE-863 Incorrect Authorization
Metrics
VersionBase scoreBase severityVector
4.07.1HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:L/SI:H/SA:N
Version: 4.0
Base score: 7.1
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:L/SI:H/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-233CAPEC-233 Privilege Escalation
CAPEC ID: CAPEC-233
Description: CAPEC-233 Privilege Escalation
Solutions

Configurations

Workarounds

Exploits

Credits

finder
ahacker1
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11
release-notes
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5
release-notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2
release-notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11
Resource:
release-notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5
Resource:
release-notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2
Resource:
release-notes
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:product-cna@github.com
Published At:18 Feb, 2026 | 21:16
Updated At:19 Feb, 2026 | 22:07

An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to merge their own pull request into a repository without having push access by exploiting an authorization bypass in the enable_auto_merge mutation for pull requests. This issue only affected repositories that allow forking as the attack relies on opening a pull request from an attacker-controlled fork into the target repository. Exploitation was only possible in specific scenarios. It required a clean pull request status and only applied to branches without branch protection rules enabled. This vulnerability affected GitHub Enterprise Server versions prior to 3.19.2, 3.18.5, and 3.17.11, and was fixed in versions 3.19.2, 3.18.5, and 3.17.11. This vulnerability was reported via the GitHub Bug Bounty program.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.1HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 7.1
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CPE Matches

GitHub, Inc.
github
>>enterprise_server>>Versions before 3.17.11(exclusive)
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
GitHub, Inc.
github
>>enterprise_server>>Versions from 3.18.0(inclusive) to 3.18.5(exclusive)
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
GitHub, Inc.
github
>>enterprise_server>>Versions from 3.19.0(inclusive) to 3.19.2(exclusive)
cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-863Secondaryproduct-cna@github.com
CWE ID: CWE-863
Type: Secondary
Source: product-cna@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11product-cna@github.com
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5product-cna@github.com
Product
Release Notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2product-cna@github.com
Product
Release Notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.11
Source: product-cna@github.com
Resource:
Product
Release Notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.5
Source: product-cna@github.com
Resource:
Product
Release Notes
Hyperlink: https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2
Source: product-cna@github.com
Resource:
Product
Release Notes

Change History

0
Information is not available yet

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