Multiple flaws patched in Edito CMS
CERT Polska coordinated disclosure of eight Edito CMS vulnerabilities, including JWT forgery enabling full account takeover, fixed in version 5.10.2607.
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What to check
- Applies to
- The 8 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT Polska, working with researchers from the AFINE Team, coordinated disclosure of eight vulnerabilities affecting Edito CMS versions prior to 5.10.2607. The most severe, CVE-2026-59074, stems from improper JWT signature verification in the refresh logic: a low-privileged authenticated user can craft a JWT containing another user's identifier and obtain a fully valid session token for any account, including administrators, enabling complete privilege escalation and impersonation.
Additional issues include a Dynamic LINQ injection (CVE-2026-59075) in paginated admin endpoints allowing character-by-character data exfiltration via response-order analysis; three stored XSS vulnerabilities (CVE-2026-59076, 59077, 59078) via profile fields, the Tiny editor content parameter, and avatar upload, which can execute attacker scripts in an administrator's browser; an unrestricted file upload flaw in the avatar function (CVE-2026-59079) bypassing file-type restrictions; and an unsafe JSON deserialization issue (CVE-2026-59081) that could allow remote code execution if an attacker can modify or inject cache entries. A separate low-severity issue (CVE-2026-59080) involves JWT tokens being sent via GET requests, exposing them to browser history disclosure, though the vendor deemed exploitation likelihood very low and declined to fix it.
All issues except CVE-2026-59080 were fixed in Edito CMS 5.10.2607, with hotfixes also released for the 5.8 branch. No in-the-wild exploitation has been reported; this is responsible disclosure coordinated by CERT Polska. Defenders running Edito CMS should upgrade immediately, given the JWT forgery flaw allows trivial full administrative takeover by any authenticated low-privileged user, and should review logs for anomalous JWT refresh activity, unexpected admin-level actions from low-privilege accounts, and unusual file uploads via avatar endpoints.
Mentioned in this report
Source reporting: https://cert.pl/en/posts/2026/11/CVE-2026-59074
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