CVE-2026-110103

MEDIUM 5.4

bbs-go through 4.4.6 Stored XSS via Image Upload Content-Type

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	mlogclub
Product	bbs-go
Published	Oct 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

mlogclub / bbs-go

0 ≤ 4.4.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/mlogclub/bbs-go/issues/305 github.com: https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/pkg/uploader/uploader.go#L90-L121 github.com: https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/api/upload_handlers.go#L36-L54 github.com: https://github.com/mlogclub/bbs-go/pull/306 github.com: https://github.com/mlogclub/bbs-go/commit/5bebf98bb9e0ac5162d4f8faf7a65fc0d496a362 vulncheck.com: https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-stored-xss-via-image-upload-content-type

Credits

George Chen