What is CVE-2026-31845?

CVE-2026-31845 is a critical-severity vulnerability in Rukovoditel Crm, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-04-11.

How severe is CVE-2026-31845?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Rukovoditel Crm

CVE-2026-31845

A reflected cross-site scripting (XSS) vulnerability exists in Rukovoditel CRM version 3.6.4 and earlier in the Zadarma telephony API endpoint (/api/tel/zadarma.php). The application directly reflects user-supplied input from the 'zd_echo' GET parameter into the HTTP response without proper sanitization, output encoding, or content-type restrictions.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-04-11 · last modified 2026-08-10.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Rukovoditel Crm — versions 3.6.4, 3.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-31845?: CVE-2026-31845 is a critical-severity vulnerability in Rukovoditel Crm, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-04-11.
How severe is CVE-2026-31845?: Critical severity. CVSS v3 base score is 9.3 out of 10.