Privilege escalation via legacy access group creation endpoint

published 2026-09-16 54 d ago modified 2026-09-23 47 d ago also EUVD-2026-80695

cvss: 8.7; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

An authenticated, non-guest user of Curiosity Workspace could enroll themselves as an administrator and member of an existing access group without an invitation or approval.

It did not grant application-wide administrator privileges, and the vulnerability could not be used to obtain root access to the application or its underlying host.

Patch / fix

fixed in 1

Curiosity GmbH Curiosity Workspace 26.8.70363

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 54 d ago (2026-09-16)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

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:H/SC:N/SI:N/SA:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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

Curiosity GmbH Curiosity Workspace

Classification

Weakness

CWE-269 Improper Privilege Management
CWE-284 Improper Access Control

References

docs.curiosity.ai /security/advisories/cve-2026-88817
vendor-advisory

Sources

CVE List CVE-2026-88817
NVD CVE-2026-88817

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.

Summary