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Exploited vulnerability · CISA KEV

Is CVE-2022-27926 exploited? Yes: in CISA KEV since 3 Apr 2023

Gociux · Synacor Zimbra Collaboration Suite (ZCS) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2022-27926, Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Apr 2023, 348 days after it was published. It affects Synacor Zimbra Collaboration Suite (ZCS). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Apr 2023
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.1CVSS 3.1 · medium
US federal due24 Apr 2023BOD 22-01 deadline

What it is

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability by allowing an endpoint URL to accept parameters without sanitizing.

VendorSynacor (19 exploited CVEs in KEV)
ProductZimbra Collaboration Suite (ZCS)
VulnerabilitySynacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-79, CWE-138
Published20 Apr 2022
Added to KEV3 Apr 2023
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Zimbra Collaboration Suite (ZCS) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Synacor CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 20 Apr 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for Synacor.

Other exploited CVEs in Zimbra Collaboration Suite (ZCS)

References

Questions

Is CVE-2022-27926 being exploited?

Yes. CISA added CVE-2022-27926 to the Known Exploited Vulnerabilities catalog on 3 Apr 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-27926 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2022-27926?

Apply updates per vendor instructions. Check Synacor's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Zimbra Collaboration Suite (ZCS) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2023 · Synacor scorecard · act-now radar.

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