CVE-2026-59109 Zalktis: SQL injection via partner-controlled fields in imported e-invoices
Attackers can execute arbitrary SQL commands via malicious e-invoice fields, potentially reading or modifying database contents.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-59109?
CVE-2026-59109 is a high-severity SQL injection vulnerability in Zalktis, published on 13 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
SQL injection in the Zalktis accounting application via trading-partner-controlled text fields in received electronic invoices. When importing a received e-invoice (UBL/PEPPOL) or an e-commerce export, Zalktis concatenates partner-controlled values directly into SQL statement text using string concatenation, with neither parameterised queries nor escaping. The application's own escaping helper, Dazadi.sql_txt(), is not invoked on these code paths, so a party that sends an invoice can break out of the string literal and alter the query logic.
This issue affects Zalktis: before 2026.1.586 and before 2026.2.592.
Which versions are affected by CVE-2026-59109?
How do I fix CVE-2026-59109?
No fix has been published for CVE-2026-59109 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-2026-59109 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59109 exists.
Sources
Also known as GHSA-r3xf-cfg3-3pgx.