CVE-2021-41174
In affected versions 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 browser.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 85.4%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
Grafana is an open-source platform for monitoring and observability. In affected versions 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 browser. The user visiting the malicious link must be unauthenticated and the link must be for a page that contains the login button in the menu bar. The url has to be crafted to exploit AngularJS rendering and contain the interpolation binding for AngularJS expressions. AngularJS uses double curly braces for interpolation binding: {{ }} ex: {{constructor.constructor(‘alert(1)’)()}}. When the user follows the link and the page renders, the login button will contain the original link with a query parameter to force a redirect to the login page. The URL is not validated and the AngularJS rendering engine will execute the JavaScript expression contained in the URL. Users are advised to upgrade as soon as possible. If for some reason you cannot upgrade, you can use a reverse proxy or similar to block access to block the literal string {{ in the path.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 85.40% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- grafana/grafana
- Source
- security-advisories@github.com
EPSS 85.4% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/grafana/grafana/commit/31b78d51c693d828720a5b285107a50e6024c912Patch, Third Party Advisory
- https://github.com/grafana/grafana/commit/3cb5214fa45eb5a571fd70d6c6edf0d729983f82Patch, Third Party Advisory
- https://github.com/grafana/grafana/commit/fb85ed691290d211a5baa44d9a641ab137f0de88Patch, Third Party Advisory
- https://github.com/grafana/grafana/security/advisories/GHSA-3j9m-hcv9-rpj8Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211125-0003/Third Party Advisory
- https://github.com/grafana/grafana/commit/31b78d51c693d828720a5b285107a50e6024c912Patch, Third Party Advisory
- https://github.com/grafana/grafana/commit/3cb5214fa45eb5a571fd70d6c6edf0d729983f82Patch, Third Party Advisory
- https://github.com/grafana/grafana/commit/fb85ed691290d211a5baa44d9a641ab137f0de88Patch, Third Party Advisory
- https://github.com/grafana/grafana/security/advisories/GHSA-3j9m-hcv9-rpj8Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211125-0003/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.