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CVE-2026-77028 yootheme.com CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T13:18:20.280Z and has not been modified since then. This vulnerability affects Joomla sites with the Zoo extension installed, particularly versions less than 4.1.66. It allows for reflected XSS and open redirect attacks via the submission redirect parameter, potentially enabling attackers to redirect users to malicious sites or execute malicious scripts. The CVSS score of 5.3 indicates a medium severity vulnerability. Further verification is recommended as details are limited. Defenders should verify the Zoo extension version, review the official advisory, and consider the potential impact on their systems. The vulnerability's operational impact could involve unauthorized script execution or user redirection to malicious sites, emphasizing the need for prompt assessment and mitigation.

Vendor
yootheme.com
Product
Zoo extension for Joomla
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-21
Original CVE updated
2026-08-26
Advisory published
2026-08-21
Advisory updated
2026-08-26

Who should care

Administrators and users of Joomla sites with the Zoo extension installed, especially those with versions less than 4.1.66, should be aware of this vulnerability. This includes site owners, developers, and security teams responsible for maintaining and securing Joomla installations. They should review the vulnerability details, assess their exposure, and take necessary actions to mitigate the risk.

Technical summary

The vulnerability exists in the Zoo extension for Joomla, versions less than 4.1.66. It allows for reflected XSS and open redirect attacks via the submission redirect parameter. This could potentially allow attackers to redirect users to malicious sites or execute malicious scripts. The CVSS score of 5.3 indicates a medium severity vulnerability.

Defensive priority

Medium priority given the CVSS score of 5.3 and the potential for reflected XSS and open redirect attacks.

Recommended defensive actions

  • Verify the version of Zoo extension and update to 4.1.66 or later if necessary.
  • Implement input validation and output encoding to prevent reflected XSS attacks.
  • Configure redirects to prevent open redirect attacks.
  • Monitor for suspicious activity and implement logging and incident response plans.

Evidence notes

The evidence provided indicates a vulnerability in the Zoo extension for Joomla, versions less than 4.1.66, allowing for reflected XSS and open redirect attacks via the submission redirect parameter. However, the details are limited, and further verification is recommended. Defenders should verify the version of the Zoo extension installed, review the official advisory, and consider the potential impact on their systems.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77028 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77028

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

  • CVE-2026-77028 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77028

    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.