CVE-2026-102103: Kiteworks Email Protection Gateway before version 9.5.0 is vulnerable to Server-Side Request Forgery (SSRF)

Q: How do I fix CVE-2026-102103?

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

Q: Is CVE-2026-102103 being exploited?

CVE-2026-102103 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-2026-102103 affect?

CVE-2026-102103 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-2026-102103?

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

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-102103 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 retrieves a certificate revocation list in an inbound messa

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-2026-102103?

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

Is CVE-2026-102103 being exploited?

CVE-2026-102103 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-2026-102103 affect?

CVE-2026-102103 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-2026-102103?

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

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References

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