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.
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
- May 6, 2026CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=12.5(1)
- Affected versionversion=12.5(1)SU1
- Affected versionversion=12.5(1)SU2
- Affected versionversion=12.5(1)SU3
- Affected versionversion=12.5(1)SU4
- Affected versionversion=12.5(1)SU5
- Affected versionversion=12.5(1)SU6
- Affected versionversion=12.5(1)SU7
- Affected versionversion=12.5(1)SU8
- Affected versionversion=12.5(1)SU8a
- Affected versionversion=12.5(1)SU9
- Affected versionversion=14
- Affected versionversion=14SU1
- Affected versionversion=14SU2
- Affected versionversion=14SU3
- Affected versionversion=14SU3a
- Affected versionversion=14SU4
- Affected versionversion=15
- Affected versionversion=15SU1
- Affected versionversion=15SU2
- Affected versionversion=15SU3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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