CVE-2026-88939: Auth Bypass (CVSS 8.3)

Description

knowns through 0.33.0 exempts the project.set action from permission guard checks unconditionally, allowing read-only agent sessions to bypass restrictions. Attackers can invoke project.set to repoint the server at another project directory and obtain write access capabilities.

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CVSS v3.1 Score

8.3

HIGH

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

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

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-863 Incorrect Authorization

References

Other References

https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/permissions/guard.go#L104-L113 https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/permissions/registry.go#L51-L54 https://github.com/knowns-dev/knowns/security/advisories/GHSA-h73x-698r-qrvg https://www.vulncheck.com/advisories/knowns-through-0.33.0-authorization-bypass-via-project-set-bootstrap-exemption https://github.com/knowns-dev/knowns/security/advisories/GHSA-h73x-698r-qrvg

Frequently Asked Questions

What is CVE-2026-88939? +

knowns through 0.33.0 exempts the project.set action from permission guard checks unconditionally, allowing read-only agent sessions to bypass restrictions. Attackers can invoke project.set to repoint the server at another project directory and obtain write access capabilities. It has a CVSS v3.1 base score of 8.3 (HIGH).

How severe is CVE-2026-88939? +

CVE-2026-88939 has a CVSS v3.1 score of 8.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-88939? +

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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