CVE-2026-91994: Auth Bypass (CVSS 6.5)

Description

Semaphore UI through 2.19.12 exempts GET and HEAD requests from project resource permission checks in GetMustCanMiddleware. Attackers with guest or task_runner roles can read all project environments including plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.23%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://github.com/semaphoreui/semaphore https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/projects/project.go#L89-L106 https://github.com/semaphoreui/semaphore/blob/v2.19.12/api/router.go#L308-L329 https://github.com/semaphoreui/semaphore/issues/4150 https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.12-missing-authorization-on-get-and-head-requests

Frequently Asked Questions

What is CVE-2026-91994? +

Semaphore UI through 2.19.12 exempts GET and HEAD requests from project resource permission checks in GetMustCanMiddleware. Attackers with guest or task_runner roles can read all project environments including plaintext secrets, credentials, and passwords via GET requests to the environment endpoint. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-91994? +

CVE-2026-91994 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-91994? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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