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Fencer Intel
medium 6.1

CVE-2019-11454 json

Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to intro…

published 7y ago modified 4mo ago also EUVD-2019-3129

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to introduce arbitrary JavaScript via manipulation of an unsanitized user field of the Authorization header for HTTP Basic Authentication, which is mishandled during an _viewlog operation.

Patch / fix

  • mmonit monit 5.25.3
  • monit Debian 14, Debian 13, Debian 12 1:5.25.3-1

debian advisories DEBIAN-CVE-2019-11454

  • monit Ubuntu Pro 14.04 LTS 1:5.6-2ubuntu0.1+esm2
  • monit Ubuntu Pro 16.04 LTS 1:5.16-2ubuntu0.2+esm1
  • monit Ubuntu Pro 18.04 LTS 1:5.25.1-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2019-11454

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

  • monit Alpine 3.7 5.24.0-r2
  • monit Alpine 3.8 5.25.2-r0
  • monit Alpine 3.9 5.25.2-r1

alpine advisories ALPINE-CVE-2019-11454

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2019-11454 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2019-11454 updated cvss 3.9

monit: cross-site scripting (XSS) in http/cervlet.c

  • 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

2.41% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/dzflack/exploits/blob/master/unix/monit_xss.py referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel 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.