SecuriTricks - CVE-2026-1355

Description

A Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to upload unauthorized content to another user’s repository migration export due to a missing authorization check in the repository migration upload endpoint. By supplying the migration identifier, an attacker could overwrite or replace a victim’s migration archive, potentially causing victims to download attacker-controlled repository data during migration restores or automated imports. An attacker would require authentication to the victim's GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.19.2, 3.18.5, 3.17.11, 3.16.14, 3.15.18, 3.14.23. This vulnerability was reported via the GitHub Bug Bounty program.

Product(s) Impacted

Vendor	Product	Versions
Github	Enterprise Server	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-862

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	github	enterprise_server	/	/	/	/	/	/	/	/
a	github	enterprise_server	/	/	/	/	/	/	/	/
a	github	enterprise_server	/	/	/	/	/	/	/	/
a	github	enterprise_server	/	/	/	/	/	/	/	/
a	github	enterprise_server	/	/	/	/	/	/	/	/
a	github	enterprise_server	/	/	/	/	/	/	/	/

References

https://docs.github.com/en/[email protected]/admin/release-notes#3.14.23

https://docs.github.com/en/[email protected]/admin/release-notes#3.15.18

https://docs.github.com/en/[email protected]/admin/release-notes#3.16.14

https://docs.github.com/en/[email protected]/admin/release-notes#3.17.11

https://docs.github.com/en/[email protected]/admin/release-notes#3.18.5

https://docs.github.com/en/[email protected]/admin/release-notes#3.19.2

CVSS Score

6.0 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: LOW
Attack Requirements: PRESENT
Privileges Required: LOW
User Interaction: NONE
Scope:
Confidentiality Impact: NONE
Integrity Impact: HIGH
Availability Impact: NONE
Exploit Maturity: NOT_DEFINED

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:L/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

View Vector String

Timeline

Published: Feb. 18, 2026, 9:16 p.m.
Last Modified: Feb. 19, 2026, 10:08 p.m.

Status : Analyzed

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-1355