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PatchSiren cyber security CVE debrief

CVE-2026-50591 Znuny CVE debrief

CVE-2026-50591 is a medium-severity vulnerability with a CVSS score of 5.4. It affects Znuny LTS before 6.5.21 and Znuny before 7.3.3. The vulnerability allows for stored user preferences XSS attacks. The CVE was published on 2026-06-05T02:17:14.187Z and last modified on 2026-06-05T14:59:31.207Z.

Vendor
Znuny
Product
Unknown
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Users of Znuny LTS before 6.5.21 and Znuny before 7.3.3 should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by improper handling of stored user preferences in Znuny LTS and Znuny. This allows an attacker to inject malicious code, leading to XSS attacks.

Defensive priority

Medium

Recommended defensive actions

  • Update to Znuny LTS 6.5.21 or later and Znuny 7.3.3 or later.
  • Review and sanitize user preferences to prevent malicious code injection.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information is available at [ref-4].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50591 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50591

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50591 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50591

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.