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Medium severity · published Oct 13, 2026
CVE-2026-110103
bbs-go through 4.4.6 Stored XSS via Image Upload Content-Type
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BB
bbs-go · mlogclub
through 4.4.6 · source: vendor
Affected product
BB
bbs-go
mlogclub
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110103
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110103
issue-tracking
https://github.com/mlogclub/bbs-go/issues/305
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
patch
https://github.com/mlogclub/bbs-go/pull/306
patch
https://github.com/mlogclub/bbs-go/commit/5bebf98bb9e0ac5162d4f8faf7a65fc0d496a362
third-party-advisory
https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-stored-xss-via-image-upload-content-type
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