No exploitation reportedFix available

CVE-2019-12300

Q: Is CVE-2019-12300 actively exploited?

Active exploitation of CVE-2019-12300 has not been confirmed. Its EPSS score was 1.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-12300?

CVE-2019-12300 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2019-05-23
Fixed in2.3.1 · 1.8.2
WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2019-05-2315:30CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-12300?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-12300?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Buildbot

Branch	Affected	Fixed in	Source
2.x	≥ 2.0.0, < 2.3.1	2.3.1	NVD · OSV
2.x	≥ 2.0.1, < 2.3.1	2.3.1	OSV
1.8	< 1.8.2	1.8.2	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Buildbot to 2.3.1 · 1.8.2

Advisories and patches

github.comMitigation · Patch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2019-05-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-12300?

Is CVE-2019-12300 actively exploited?

Active exploitation of CVE-2019-12300 has not been confirmed. Its EPSS score was 1.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-12300?

CVE-2019-12300 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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