How severe is CVE-2019-12300?

CVE-2019-12300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-12300 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12300?

CVE-2019-12300 affects Buildbot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-12300 published?

CVE-2019-12300 was published on 2019-05-23 and last updated on 2026-06-17.

CVE-2019-12300

CVE-2019-12300 is a critical-severity vulnerability in Buildbot with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Buildbot
Published: 2019-05-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-12300?: 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.
How severe is CVE-2019-12300?: CVE-2019-12300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-12300 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12300?: CVE-2019-12300 affects Buildbot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-12300 published?: CVE-2019-12300 was published on 2019-05-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:buildbot:buildbot:*:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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