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Fencer Vulns
critical 9.8

CVE-2019-12300 json

Improper Authentication in Buildbot

published 2019-05-23 7 y ago modified 2026-06-17 4 mo ago also GHSA-g86p-hgx5-2pfh , PYSEC-2019-6 , EUVD-2019-0025

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

Buildbot before 1.8.2 and 2.x before 2.3.1 accepts a user-submitted authorization token from OAuth and uses it to authenticate a user. If an attacker has a token allowing them to read the user details of a victim, they can login as the victim.

Patch / fix

  • pypi buildbot 1.8.2, 2.3.1
  • buildbot buildbot 1.8.2, 2.3.1
  • buildbot Debian 14, Debian 13, Debian 12 2.0.1-2

debian advisories DEBIAN-CVE-2019-12300

  • buildbot Ubuntu 20.04 LTS 2.3.1-1

ubuntu advisories UBUNTU-CVE-2019-12300

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-2019-12300 updated cvss 5.9

buildbot: Improper authentication using OAuth token authorization

  • 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

1.84% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi buildbot
<1.8.2
>=2.0.0, <2.3.1
>=2.0.1, <2.3.1
1.8.2
2.3.1

Classification

Weakness

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.