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Fencer Vulns
high 7.3

CVE-2016-7966 json

Through a malicious URL that contained a quote character it was possible to inject HTML code in KMail's plaintext viewer.

published 2016-12-23 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8814

cvss
7.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

Through a malicious URL that contained a quote character it was possible to inject HTML code in KMail's plaintext viewer. Due to the parser used on the URL it was not possible to include the equal sign (=) or a space into the injected HTML, which greatly reduces the available HTML functionality. Although it is possible to include an HTML comment indicator to hide content.

Patch / fix

  • kcoreaddons Debian 14, Debian 13, Debian 12 5.26.0-3

debian advisories DEBIAN-CVE-2016-7966

  • kdepimlibs Ubuntu 14.04 LTS 4:4.13.3-0ubuntu0.4
  • kcoreaddons Ubuntu 16.04 LTS 5.18.0-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2016-7966

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kcoreaddons Package Hub 12 SP1 5.20.0-6.1

opensuse advisories openSUSE-SU-2016:2558-1openSUSE-SU-2016:2559-1

  • kcoreaddons Arch Linux 5.26.0-2

arch linux advisories AVG-43

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-7966 updated cvss 4.3

kdepim: HTML injection in plain text viewer of KMail

  • Red Hat Enterprise Linux 5 kdepim Red Hat Enterprise Linux 6 kdepim, kdepim-libs, kdepim3-libs Red Hat Enterprise Linux 7 kdepim, kdepim-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.34% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.