Zalktis: SQL injection via partner-controlled fields in imported e-invoices

published 2026-08-13 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-58133

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

Zalktis Programmas (SIA "Zalktis Programmas") Zalktis 2026.1.586, 2026.2.592

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-08-14)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

offseq.com https://offseq.com/en/research/zalktis-cve-2026-59109/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Zalktis Programmas (SIA "Zalktis Programmas") Zalktis

Classification

Weakness

CWE-89 Improper Neutralization of Special Elements used in an SQL Command
CWE-20 Improper Input Validation

References

offseq.com /en/research/zalktis-cve-2026-59109/
exploit
offseq.com /en/research/zalktis-cve-2026-59109
technical-description
cvd.cert.lv /disclosed/vuln-all-631428755
government-resource, permissions-required

Sources

CVE List CVE-2026-59109
NVD CVE-2026-59109

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary