CVE-2026-8467: phenixdigital phoenix_storybook · Code Injection
Affects phenixdigital phoenix_storybookSource CVE Database V5
Not known to be exploited · CVSS 9.5 Critical : upgrade to 1.1.0 as a priority.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 2.1% chance of exploitation in 30 days – higher than 81% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.1.0, 56ab8464d4375fa52db806148a06cce126ad481d
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HExploitation evidence
Disclosed: evidence found.
CVE published 20 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade phoenix_storybook and phenixdigital/phoenix_storybook to 1.1.0; phoenix_storybook to 56ab8464d4375fa52db806148a06cce126ad481d.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| phenixdigitalphoenix_storybook | Affected
| Fixed in
|
| phenixdigitalphoenix_storybook | Affected
| Fixed in
|
Hexphenixdigital/phoenix_storybookpkg:hex/phenixdigital/phoenix_storybookOther threats | Affected
| Fixed in
|
Hexphoenix_storybookpkg:hex/phoenix_storybookOther threats | Affected
| Fixed in
|
CPE configurations (1)
cpe:2.3:a:phenixdigital:phoenix_storybook:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, avoid exposing the vulnerable phoenix_storybook versions to untrusted networks or unauthenticated users. Do not rely on generic mitigations as the vulnerability specifically involves unsanitized HEEx template interpolation.
Description
Code Injection vulnerability in phenixdigital phoenix_storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handle_event/3 accepts arbitrary attribute names and values from unauthenticated clients. These values are passed to 'Elixir.PhoenixStorybook.Helpers.ExtraAssignsHelpers':handle_set_variation_assign/3, which stores them verbatim. When rendering, 'Elixir.PhoenixStorybook.Rendering.ComponentRenderer':attributes_markup/1 interpolates binary attribute values directly into a HEEx template string as name="<val>" without escaping double quotes or HEEx expression delimiters. An attacker can supply a value containing a closing quote followed by a HEEx expression block (e.g.foo" injected={EXPR} bar="), which causes EXPR to be treated as an inline Elixir expression. The resulting template is compiled via EEx.compile_string/2 and executed via Code.eval_quoted_with_env/3 with full Kernel imports and no sandbox, giving the attacker arbitrary code execution on the server. This issue affects phoenix_storybook from 0.5.0 before 1.1.0.
Reports on CVE-2026-8467
References
- github.com/phenixdigital/phoenix_storybook/security/advisories/GHSA-55hg-8qxv-qj4p (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-8467.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-8467 (opens in a new tab)
- github.com/phenixdigital/phoenix_storybook/commit/56ab8464d4375fa52db806148a06cce126ad481d (opens in a new tab)