CVE-2018-19516Network attack vector

Information disclosure via unrestricted HTML refresh directives

Published Mar 12, 2020 · Updated Aug 5, 2024

Improper input validation in KDE Applications messagelib before 18.12.0 allows remote attackers to disclose data via crafted HTML messages. DefaultRenderer emits an untrusted http-equiv REFRESH directive into rendered message HTML instead of rejecting it, enabling automatic navigation to an attacker-selected URI. Delivery of a crafted message is sufficient; the documented impact is limited to confidentiality, with no integrity or availability loss.

CVSS severity5.3
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in KDE Applications messagelib before 18.12.0 allows remote attackers to disclose data via crafted HTML messages. DefaultRenderer emits an untrusted http-equiv REFRESH directive into rendered message HTML instead of rejecting it, enabling automatic navigation to an attacker-selected URI. Delivery of a crafted message is sufficient; the documented impact is limited to confidentiality, with no integrity or availability loss.

The record

CVE
CVE-2018-19516
Published
Mar 12, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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-20Improper Input Validation

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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