Auth bypass in Bytebase
CVE-2026-115321
Bytebase before 3.16.0 contains an authorization bypass vulnerability in the UpdateIssueComment handler that allows low-privileged project users to modify comments in other projects by supplying a foreign comment UID. Attackers with any project role, including Project Viewer, can set their own project's issue as parent and reference another project's comment UID to overwrite comments they cannot access.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/bytebase/bytebase/issues/19369 (issue-tracking)
- github.com/bytebase/bytebase/pull/19552 (issue-tracking, patch)
- github.com/bytebase/bytebase/commit/270e25529731b59988b58f4a4b3bda431c748bc9 (patch)
- github.com/bytebase/bytebase/releases/tag/3.16.0 (release-notes)
- github.com/bytebase/bytebase/blob/3.15.1/backend/api/v1/issue_service.go (technical-description)
- github.com/bytebase/bytebase (product)
- www.vulncheck.com/advisories/bytebase-before-3.16.0-authorization-bypass-via-up… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115321?
- CVE-2026-115321 is a medium-severity vulnerability in Bytebase, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-10-22.
- How severe is CVE-2026-115321?
- Medium severity. CVSS v3 base score is 4.3 out of 10.