vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-41088

Remote code execution via the web UI backend of Elvish

HIGH
8.8
CVSS Score
Published: September 23, 2021 at 07:55 PM UTC
Updated: June 17, 2026 at 04:07 AM UTC
2 products affected across 2 vendorsElvishElvish

Using elvish by elves?

Get instant alerts when new vulnerabilities affect elvish - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH8.8
Exploit prediction
EPSS 0.5%

Description

Elvish is a programming language and interactive shell, combined into one package. In versions prior to 0.14.0 Elvish's web UI backend (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI. The backend does not check the origin of requests correctly. As a result, if the user has the web UI backend open and visits a compromised or malicious website, the website can send arbitrary code to the endpoint in localhost. All Elvish releases from 0.14.0 onward no longer include the the web UI, although it is still possible for the user to build a version from source that includes the web UI. The issue can be patched for previous versions by removing the web UI (found in web, pkg/web or pkg/prog/web, depending on the exact version).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Elvish· Elv
95%
v < 0.14.0
Affected range stops below 0.14.0, so it looks safe — our inference, not a vendor statement
Elvish· Elves
60%
v < 0.14.0
Affected range stops below 0.14.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-668CWE-346

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card