CVE-2026-111639
HighCVSS 8.1Summary
bbs-go through 4.4.6 contains an authentication bypass vulnerability in the /api/login/google_one_tap endpoint that allows remote attackers to log in as other users by submitting Google ID tokens issued to any OAuth client. Attackers operating their own Google OAuth client can capture a victim's Google-signed ID token and replay it, since the aud claim is never checked, to obtain an authenticated session as the victim's Google-linked account.
Risk Assessment
A remote attacker can take over a victim's Google-linked account, gaining access to their data and privileges on the site.
Recommendation
Upgrade bbs-go beyond 4.4.6 and validate the aud claim of Google ID tokens to ensure they were issued for the expected OAuth client.
Other vulnerabilities in bbs-go
See all- CVE-2026-103396Medium
bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.
- CVE-2026-110103Medium
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.
- CVE-2023-36223Medium
A Cross-Site Scripting vulnerability in bbs-go version 3.5.5 and earlier allows a remote attacker to execute arbitrary JavaScript code via a crafted payload in the 'announcements' parameter of the settings function.
- CVE-2023-36222Medium
Cross Site Scripting (XSS) vulnerability in bbs-go version 3.5.5 and earlier. A remote attacker can execute arbitrary code via a crafted payload in the comment parameter of the article function.
Original NVD description (English source)
bbs-go through 4.4.6 contains an authentication bypass vulnerability in the /api/login/google_one_tap endpoint that allows remote attackers to log in as other users by submitting Google ID tokens issued to any OAuth client. Attackers operating their own Google OAuth client can capture a victim's Google-signed ID token and replay it, since the aud claim is never checked, to obtain an authenticated session as the victim's Google-linked account.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS