CVE-2026-20035Network attack vector

Unauthenticated SSRF via unvalidated Web Inbox requests

Published May 6, 2026 · Updated May 6, 2026

SSRF in Cisco Unity Connection Web Inbox allows remote attackers to send arbitrary network requests through an affected device. The Web Inbox web UI fails to validate attacker-controlled input in specific HTTP requests before using it to originate outbound network requests. No authentication is required, but Web Inbox must be enabled; it is enabled by default, and the resulting requests originate from the device.

CVSS severity7.2
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Cisco Unity Connection Web Inbox allows remote attackers to send arbitrary network requests through an affected device. The Web Inbox web UI fails to validate attacker-controlled input in specific HTTP requests before using it to originate outbound network requests. No authentication is required, but Web Inbox must be enabled; it is enabled by default, and the resulting requests originate from the device.

The record

CVE
CVE-2026-20035
Published
May 6, 2026
Updated
May 6, 2026
Vendor
ClamAV
Product
Cisco Unity Connection
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.5(1)
  2. Affected versionversion=12.5(1)SU1
  3. Affected versionversion=12.5(1)SU2
  4. Affected versionversion=12.5(1)SU3
  5. Affected versionversion=12.5(1)SU4
  6. Affected versionversion=12.5(1)SU5
  7. Affected versionversion=12.5(1)SU6
  8. Affected versionversion=12.5(1)SU7
  9. Affected versionversion=12.5(1)SU8
  10. Affected versionversion=12.5(1)SU8a
  11. Affected versionversion=12.5(1)SU9
  12. Affected versionversion=14
  13. Affected versionversion=14SU1
  14. Affected versionversion=14SU2
  15. Affected versionversion=14SU3
  16. Affected versionversion=14SU3a
  17. Affected versionversion=14SU4
  18. Affected versionversion=15
  19. Affected versionversion=15SU1
  20. Affected versionversion=15SU2
  21. Affected versionversion=15SU3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Unity Connectionversion=12.5(1); version=12.5(1)SU1; version=12.5(1)SU2; version=12.5(1)SU3; version=12.5(1)SU4; version=12.5(1)SU5; version=12.5(1)SU6; version=12.5(1)SU7; version=12.5(1)SU8; version=12.5(1)SU8a; version=12.5(1)SU9; version=14; version=14SU1; version=14SU2; version=14SU3; version=14SU3a; version=14SU4; version=15; version=15SU1; version=15SU2; version=15SU3

Published CVSS scores

7.2Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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