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.
Does this matter?
Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.28% probability · 21th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-639
- Source
- disclosure@vulncheck.com
EPSS moved from 0.2% on 23 October 2026 to 0.3% on 27 October 2026.
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
- https://github.com/bytebase/bytebase/releases/tag/3.16.0
- https://www.vulncheck.com/advisories/bytebase-before-3.16.0-authorization-bypass-via-updateissuecomment
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.