XSS vulnerability allowing arbitrary JavaScript execution

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N

EPSS

• CVE-2021-41174: 85.40% estimated exploitation activity in the next 30 days; percentile 99.72 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Today we are releasing Grafana 8.2.3. This patch release includes an important security fix for an issue that affects all Grafana versions from 8.0.0-beta1. Grafana Cloud instances have already been patched and an audit did not find any usage of this attack vector. Grafana Enterprise customers were provided with updated binaries under embargo. CVE-2021-41174 XSS vulnerability on unauthenticated pages Summary CVSS Score: 6.9 Medium CVSS:CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N/E:U/RL:O/RC:R/CR:L/MAV:N/MAC:H/MPR:N/MUI:R/MS:C/MC:N/MI:H/MA:L We received a security report to security@grafana.com on 2021-10-21 about a vulnerability in Grafana regarding the XSS vulnerability. It was later identified as affecting Grafana versions from 8.0.0-beta1 to 8.2.2. CVE-2021-41174 has been assigned to this vulnerability. Impact If an attacker is able to convince a victim to visit a URL referencing a vulnerable page, arbitrary JavaScript content may be executed within the context of the victim's…

Published by the source

8 Nov 2021, 18:13 UTC

Last modified by the source

8 Jul 2026, 06:29 UTC

Source last checked

26 Oct 2026, 12:21 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-3j9m-hcv9-rpj8

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-3j9m-hcv9-rpj8

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# Patch Next advisory brief: CVE-2021-41174

Advisory: XSS vulnerability allowing arbitrary JavaScript execution
IDs: CVE-2021-41174, GHSA-3j9m-hcv9-rpj8
Record: https://patchnext.com/advisories/cve-2021-41174 (revision 2, source checked 26 Oct 2026, 12:21 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @grafana/data 8.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @grafana/data: affected >= 8.0.0, < 8.2.3; fixed in 8.2.3

## Suggested inspection (read-only)
- `npm ls @grafana/data --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @grafana/data.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-3j9m-hcv9-rpj8 (OSV record GHSA-3j9m-hcv9-rpj8 lists affected ranges: npm @grafana/data >=8.0.0 <8.2.3 (fixed))
- Verified: https://github.com/advisories/GHSA-3j9m-hcv9-rpj8 (GitHub-reviewed advisory GHSA-3j9m-hcv9-rpj8 lists affected ranges: npm @grafana/data >=8.0.0 <8.2.3)

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