Vulnerability · Published Oct 22, 2026 · Assigned by VulnCheck

CVE-2026-115321Bytebase before 3.16.0 Authorization Bypass via UpdateIssueComment

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in bytebase from bytebase. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 79.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
bytebase	bytebase	0 – before 3.16.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/bytebase/bytebase/issues/19369 issue-tracking
https://github.com/bytebase/bytebase/pull/19552 patch, issue-tracking
https://github.com/bytebase/bytebase/commit/270e25529731b59988b58f4a4b3bda431c748bc9 patch
3.16.0 Release Notes release-notes
https://github.com/bytebase/bytebase/blob/3.15.1/backend/api/v1/issue_service.go#L1116 technical-description
https://github.com/bytebase/bytebase product
VulnCheck Advisory: Bytebase before 3.16.0 Authorization Bypass via UpdateIssueComment third-party-advisory