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.

CVSS 4.0

5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-25)

CWE

CWE-639

Published

2026-10-22

Modified

2026-10-23

Record from

the NVD, synced 2026-10-23

References

• https://github.com/bytebase/bytebase
• https://github.com/bytebase/bytebase/blob/3.15.1/backend/api/v1/issue_service.go#L1116
• https://github.com/bytebase/bytebase/commit/270e25529731b59988b58f4a4b3bda431c748bc9
• https://github.com/bytebase/bytebase/issues/19369
• https://github.com/bytebase/bytebase/pull/19552

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