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Fencer Vulns
high 8.8

CVE-2019-3465 json

Signature validation bypass in XmlSecLibs

published 2019-11-07 7 y ago modified 2026-06-17 4 mo ago also GHSA-pqm6-cgwr-x6pf , EUVD-2019-0760

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

Rob Richards XmlSecLibs, all versions prior to v3.0.3, as used for example by SimpleSAMLphp, performed incorrect validation of cryptographic signatures in XML messages, allowing an authenticated attacker to impersonate others or elevate privileges by creating a crafted XML message.

Patch / fix

  • packagist robrichards/xmlseclibs 2.1.1, 3.0.4
  • simplesamlphp Debian 14, Debian 12 1.17.6-2

debian advisories DEBIAN-CVE-2019-3465

  • simplesamlphp Ubuntu Pro 16.04 LTS 1.14.0-1ubuntu2+esm1
  • simplesamlphp Ubuntu Pro 18.04 LTS 1.15.3-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2019-3465

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-2019-3465 updated cvss 6.3

php-robrichards-xmlseclibs: allows attackers to impersonate others via crafted XML message

  • 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

2.99% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist robrichards/xmlseclibs
>=3.0.0, <3.0.4
>=1.0.0, <2.1.1
3.0.4
2.1.1

Affected products

  • n/a Rob Richards XmlSecLibs

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

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.