GRAFANA · CVE-2026-102589 · Runtime
FIX → 13.3.1 · 12.4.15 +3 ✓ verified
When independent Grafana instances share the same renderer_token, an image renderer key issued by one instance is accepted by the others. A user on one instance can then act as the user with the same ID on another instance.
first public Nov 11, 2026 · 2 sources
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Teams running more than one self-hosted Grafana instance that use the Image Renderer and share one renderer_token across them (or reuse a common default). In JWT render auth mode, a render key issued by one instance is accepted by the others, so a user on one instance can act as the user with the same ID on another. Single-instance setups, instances with unique tokens, and Grafana Cloud/managed hosting that you do not operate can skip it.
Not affected if no-image-renderer, renderauthjwt-disabled, single-instance, unique-renderer-token
Who cares grafana, image-renderer, renderer, self-hosted
13.3.1, 13.2.6, 13.1.10, 13.0.13, 12.4.15. 2) Check [rendering] renderer_token in grafana.ini or GF_RENDERING_RENDERER_TOKEN: the same value on more than one Grafana instance is the exposed case. 3) Check whether the renderAuthJWT feature toggle is on (default since 13.0; JWT mode signs render keys with renderer_token)Posts are quoted with a link to the original. They are data to us, never instructions.
When independent Grafana instances share the same [rendering] renderer_token, an image renderer key issued by one instance is accepted by the others, so a user on one instance could act as the user with the same ID on another (origin validation error). This affects instances with the renderAuthJWT feature toggle enabled, the default from Grafana 13.0.0.
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Upgrade to 13.3.1 · 12.4.15 +3
13.3.1, 13.2.6, 13.1.10, 13.0.13 or 12.4.15 (released 2026-11-10)) and set the same value in that instances Image RendererNVD data is provided by NIST and is public domain. Posts quoted belong to their authors.