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Exploited vulnerability · CISA KEV

Is CVE-2023-5631 exploited? Yes: in CISA KEV since 26 Oct 2023

Gociux · Roundcube Webmail · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-5631, Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 26 Oct 2023, 8 days after it was published. It affects Roundcube Webmail. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 26 Oct 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity6.1CVSS 3.1 · medium
US federal due16 Nov 2023BOD 22-01 deadline

What it is

Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.

VendorRoundcube (11 exploited CVEs in KEV)
ProductWebmail
VulnerabilityRoundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
WeaknessCWE-79
Published18 Oct 2023
Added to KEV26 Oct 2023
Reported by (CNA)ESET

What to do

  1. Check whether you run it. Look for Webmail in your asset inventory, including appliances and cloud images. Stack check lists every exploited Roundcube CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 18 Oct 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Roundcube.

Other exploited CVEs in Webmail

References

Questions

Is CVE-2023-5631 being exploited?

Yes. CISA added CVE-2023-5631 to the Known Exploited Vulnerabilities catalog on 26 Oct 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-5631 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-2023-5631?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Roundcube's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Webmail 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 October 2023 · Roundcube scorecard · act-now radar.

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