Buttercup buttercup-browser-extension Vault access control

Published 14 mo ago 2025-08-15 · modified 4 mo ago 2026-06-17 · JSON

CVSS

3.1

v3.1 · CNA

CISA KEV

not known exploited

EPSS

0.5%

percentile 44%

Public exploits

none known

A vulnerability was found in Buttercup buttercup-browser-extension up to 0.14.2. Affected by this vulnerability is an unknown functionality of the component Vault Handler. The manipulation results in improper access controls. The attack may be performed from a remote location. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit has been made public and could be used. Upgrading to version 1.0.1 addresses this issue. The patch is identified as 89. Upgrading the affected component is recommended. This vulnerability only affects products that are no longer supported by the maintainer.

CISA SSVC assessment

Exploitation: Proof of concept public
Automatable: no
Technical impact: partial
Assessed: 14 mo ago 2025-08-18

Exploit prediction (EPSS)

0.51% probability of exploitation in the next 30 days, higher than 44% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CNA	4.0	2.3	`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`
CNA	3.1	3.1	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C`
CNA	3.0	3.1	`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C`
CNA	2.0	2.6	`AV:N/AC:H/Au:N/C:P/I:N/A:N/E:POC/RL:OF/RC:C`
CNA	4.0	1.3	`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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`
CNA	3.1	3.1	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N`
NVD	3.1	6.5	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`
CNA	2.0	2.6	`AV:N/AC:H/Au:N/C:P/I:N/A:N`

Affected products

Buttercup buttercup-browser-extension

Classification

Weakness

CWE-284 Improper Access Control
CWE-266 Incorrect Privilege Assignment

References

vuldb.com /?id.319969 · vdb-entry, technical-description
vuldb.com /?ctiid.319969 · signature, permissions-required
vuldb.com /?submit.628170 · third-party-advisory
github.com /buttercup/buttercup-browser-extension/issues/92 · issue-tracking
github.com /buttercup/buttercup-browser-extension/issues/92#issuecomment-358449755 · issue-tracking
github.com /buttercup/buttercup-browser-extension/issues/92#issuecomment-372991430 · exploit, issue-tracking
github.com /buttercup/buttercup-browser-extension/pull/89 · issue-tracking, patch
github.com /buttercup/buttercup-browser-extension/releases/tag/v1.0.1 · patch

Sources

CVE List: CVE-2017-20199
NVD: CVE-2017-20199

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary