CVE-2026-111667: REBUILD through 4.5.0 Missing Authorization via /project/comments/list Endpoint

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-16 · updated 2026-10-16
Weakness: CWE-639

Description

REBUILD through 4.5.0 contains a missing authorization vulnerability in TaskCommentController.commentList that allows authenticated low-privileged users to read task comments without project membership checks. Attackers can supply the id of a task in a private project to the /project/comments/list endpoint to retrieve its comment content and attachment references.

Affected products

getrebuild rebuild: through 4.5.0

References

https://github.com/getrebuild/rebuild/blob/4.5.0/src/main/java/com/rebuild/web/project/TaskCommentController.java#L37-L62
https://hackmd.io/@hieuPenguinnn/getrebuild-rebuild-project-task-comment-idor
https://www.vulncheck.com/advisories/rebuild-through-4.5.0-missing-authorization-via-project-comments-list-endpoint
https://hackmd.io/@hieuPenguinnn/getrebuild-rebuild-project-task-comment-idor

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