CVE-2026-3516Network attack vector

Contributor-level stored XSS via unsanitized iframe attributes

Published Mar 20, 2026 · Updated Mar 20, 2026

Stored XSS in Tammersoft Contact List for WordPress 3.0.18 and earlier allows remote authenticated users to inject scripts via _cl_map_iframe. The saveCustomFields() function extracts an iframe from that field with a regex, stores its unvalidated attributes in post metadata, and class-cl-public-card.php renders the HTML without escaping or wp_kses filtering. Contributor-level access is required, and a stored event handler executes in the browser of anyone who opens the affected page.

CVSS severity6.4
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Tammersoft Contact List for WordPress 3.0.18 and earlier allows remote authenticated users to inject scripts via _cl_map_iframe. The saveCustomFields() function extracts an iframe from that field with a regex, stores its unvalidated attributes in post metadata, and class-cl-public-card.php renders the HTML without escaping or wp_kses filtering. Contributor-level access is required, and a stored event handler executes in the browser of anyone who opens the affected page.

The record

CVE
CVE-2026-3516
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Tammersoft
Product
Contact List – Online Staff Directory & Address Book
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=* <=3.0.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tammersoft · Contact List – Online Staff Directory & Address Bookversion=* <=3.0.18

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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