Medium severity · published Oct 22, 2026
CVE-2026-115321
Bytebase before 3.16.0 Authorization Bypass via UpdateIssueComment
New
4.3
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BY
bytebase · bytebase
before 3.16.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115321
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115321
github.com
https://github.com/bytebase/bytebase
github.com
https://github.com/bytebase/bytebase/blob/3.15.1/backend/api/v1/issue_service.go#L1116
github.com
https://github.com/bytebase/bytebase/commit/270e25529731b59988b58f4a4b3bda431c748bc9
github.com
https://github.com/bytebase/bytebase/issues/19369
github.com
https://github.com/bytebase/bytebase/pull/19552
github.com
https://github.com/bytebase/bytebase/releases/tag/3.16.0
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