CVE-2026-102104: Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF)

Q: How do I fix CVE-2026-102104?

kiteworks: upgrade to 9.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-102104 being exploited?

CVE-2026-102104 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-102104 affect?

CVE-2026-102104 affects kiteworks. Severity is critical (CVSS 9.1). Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF). A server-side request forgery (SSRF) weakness in Kiteworks Email Protection Gateway could allow a remote, unauthenticated attacker

Q: How urgent is CVE-2026-102104?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-102104 is a critical-severity flaw (CVSS 9.1) affecting kiteworks. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF). A server-side request forgery (SSRF) weakness in Kiteworks Email Protection Gateway could allow a remote, unauthenticated attacker to induce the gateway to issue crafted requests to internal or otherwise unintended network destinations. The requests are triggered while the gateway performs an online certificate status check for an inbound

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-09-30
Last modified	2026-10-08

Publisher (CNA): Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government · Vendor: accellion

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-30 21:16 UTCPublished CVE record published
2026-10-08 13:43 UTCUpdated Record last modified

accellion kiteworks UPGRADE

Affected: < 9.5.0

Fixed in: 9.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kiteworks || rpm -q kiteworks || kiteworks --version

2. UPGRADE to 9.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kiteworks

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kiteworks

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-102104?

kiteworks: upgrade to 9.5.0. Exact commands for each OS are on this page.

Is CVE-2026-102104 being exploited?

CVE-2026-102104 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-102104 affect?

CVE-2026-102104 affects kiteworks. Severity is critical (CVSS 9.1). Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF). A server-side request forgery (SSRF) weakness in Kiteworks Email Protection Gateway could allow a remote, unauthenticated attacker

How urgent is CVE-2026-102104?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

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References

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