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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-27191

22
FAUCET Score

CVE-2026-27191 is a URL authority injection vulnerability affecting Feathersjs versions 5.0.39 and below. Attackers can exploit this flaw by manipulating the redirect query parameter, leading to the theft of access tokens and full account takeover. The vulnerability has a CVSS score of 6.1 (Medium) and requires user interaction, but can be exploited remotely with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.40CPE matchmatch criteria
cpe:2.3:a:feathersjs:feathers:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

7.4HIGH

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/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

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.25%
Probability of exploitation in next 30 days
EPSS Percentile
16.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0025 is in the 17th percentile among its peer group of 26,220 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @feathersjs/authentication-oauthFixed in: 5.0.40

Vendor Advisories (1)

npmGHSA-ppf9-4ffw-hh4phigh

Feathers has an open redirect in OAuth callback enables account takeover

Feb 19, 2026

References

github.com / feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401
Patch
github.com / feathersjs/feathers/releases/tag/v5.0.40
ProductRelease Notes
github.com / feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p
Third Party Advisory