Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck
CVE-2026-110103bbs-go through 4.4.6 Stored XSS via Image Upload Content-Type
Medium 5.4
In plain English
A medium-severity cross-site scripting in bbs-go from mlogclub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 86.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
bbs-go through 4.4.6 contains a stored cross-site scripting vulnerability that allows authenticated users to upload HTML or SVG files by spoofing the multipart Content-Type in POST /api/upload. Attackers can upload script-bearing documents served inline from /res and send their URLs to administrators, executing script on the forum's origin.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/mlogclub/bbs-go/issues/305 issue-tracking, technical-description
- https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/pkg/uploader/uploader.go#L90-L121 technical-description
- https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/api/upload_handlers.go#L36-L54 technical-description
- https://github.com/mlogclub/bbs-go/pull/306 patch, issue-tracking
- https://github.com/mlogclub/bbs-go/commit/5bebf98bb9e0ac5162d4f8faf7a65fc0d496a362 patch
- VulnCheck Advisory: bbs-go through 4.4.6 Stored XSS via Image Upload Content-Type third-party-advisory