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PatchSiren cyber security CVE debrief

CVE-2018-6882 Synacor CVE debrief

CVE-2018-6882 is a cross-site scripting (XSS) vulnerability affecting Synacor Zimbra Collaboration Suite (ZCS). CISA added it to the Known Exploited Vulnerabilities (KEV) catalog on 2022-04-19 and marked it as having known ransomware campaign use, which makes it a high-priority remediation item for any organization running ZCS. The supplied sources instruct defenders to apply vendor updates per vendor instructions.

Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
CVSS
MEDIUM 6.1
CISA KEV
Listed
Original CVE published
2022-04-19
Original CVE updated
2022-04-19
Advisory published
2022-04-19
Advisory updated
2022-04-19

Who should care

Administrators, security teams, and incident responders responsible for Synacor Zimbra Collaboration Suite (ZCS) deployments should treat this as a priority, especially teams managing systems tracked against CISA KEV.

Technical summary

The supplied source corpus identifies CVE-2018-6882 as a cross-site scripting (XSS) issue in Synacor Zimbra Collaboration Suite (ZCS). CISA’s KEV metadata records it as a known exploited vulnerability, includes a note referencing NVD, and flags known ransomware campaign use. The corpus does not provide affected version ranges, attack preconditions, exploit mechanics, or CVSS scoring, so remediation guidance is limited to applying vendor updates.

Defensive priority

High. This is a CISA KEV-listed vulnerability with known ransomware campaign use, so remediation should be treated as urgent. CISA added the entry on 2022-04-19 and set a remediation due date of 2022-05-10 in the supplied metadata.

Recommended defensive actions

  • Apply vendor updates per vendor instructions for all Synacor Zimbra Collaboration Suite (ZCS) instances.
  • Confirm every ZCS deployment is included in remediation tracking, including any forgotten or legacy instances.
  • Verify patch status after maintenance and document completion against the KEV remediation requirement.
  • Use the official CVE, NVD, and CISA KEV references to confirm current remediation guidance and status.

Evidence notes

The source corpus consists primarily of CISA KEV metadata and official reference links. It explicitly names Synacor Zimbra Collaboration Suite (ZCS), identifies the issue as XSS, records dateAdded 2022-04-19, dueDate 2022-05-10, and notes known ransomware campaign use plus the required action to apply updates per vendor instructions. No exploit details, affected versions, or CVSS score are included in the provided sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-6882 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-6882

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

  • CVE-2018-6882 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-6882

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

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

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.