CVE-2026-88939 json
knowns through 0.33.0 Authorization Bypass via project.set Bootstrap Exemption
published 2026-09-10 59 d ago modified 2026-09-15 54 d ago also EUVD-2026-75582
- cvss
- 8.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 54 d ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/knowns-dev/knowns/security/advisories/GHSA-h73x-698r-qrvg referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- knowns-dev knowns
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/knowns-dev/knowns/security/advisories/GHSA-h73x-698r-qrvg
vendor-advisory, exploit
-
github.com
/knowns-dev/knowns/blob/v0.33.0/internal/permissions/guard.go#L104-L113
technical-description
-
github.com
/knowns-dev/knowns/blob/v0.33.0/internal/permissions/registry.go#L51-L54
technical-description
-
vulncheck.com
/advisories/knowns-through-0.33.0-authorization-bypass-via-project-set-bootstrap-exemption
third-party-advisory
Sources
- CVE List CVE-2026-88939
- NVD CVE-2026-88939
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.