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Fencer Vulns
medium 6.5

CVE-2020-11880 json

An issue was discovered in KDE KMail before 19.12.3.

published 2020-04-17 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4220

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

An issue was discovered in KDE KMail before 19.12.3. By using the proprietary (non-RFC6068) "mailto?attach=..." parameter, a website (or other source of mailto links) can make KMail attach local files to a composed email message without showing a warning to the user, as demonstrated by an attach=.bash_history value.

Patch / fix

  • kde kmail 19.12.3
  • kmail Debian 14, Debian 13, Debian 12 4:20.04.1-1

debian advisories DEBIAN-CVE-2020-11880

  • kmail Ubuntu Pro 18.04 LTS 4:17.12.3-0ubuntu1+esm1
  • kmail Ubuntu Pro 20.04 LTS 4:19.12.3-0ubuntu1+esm1
  • kdepim Ubuntu Pro 14.04 LTS 4:4.13.3-0ubuntu0.2+esm1
  • kdepim Ubuntu Pro 16.04 LTS 4:15.12.3-0ubuntu1.1+esm1

ubuntu advisories UBUNTU-CVE-2020-11880

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

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-2020-11880 updated cvss 6.5

kmail: using a special parameter an attacker can force kmail to attach local files to a composed email

  • Red Hat All currently supported Red Hat products
    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

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

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.