CVE-2026-104456 YesWiki before 4.6.7 Second-Order SQL Injection via ACL Username
Attackers can inject SQL via self-registered usernames to read database contents and bypass read ACLs in YesWiki.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104456?
CVE-2026-104456 is a high-severity SQL injection vulnerability in yeswiki, published on 2 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
YesWiki before 4.6.7 contains a second-order SQL injection vulnerability in AclService::updateRequestWithACL, where a stored username is concatenated unescaped into a read-ACL LIKE clause. Attackers can self-register an account name containing a double-quote payload, then load non-admin ACL-filtered listings to read database contents and bypass read ACLs.
Weakness: CWE-89
Which versions are affected by CVE-2026-104456?
How do I fix CVE-2026-104456?
No fix has been published for CVE-2026-104456 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-104456 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104456 exists.
Sources
Also known as GHSA-6rw5-62xf-q5xp, GHSA-m352-5gh7-99x6.