CVE-2026-54239

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Source
https://cve.org/CVERecord?id=CVE-2026-54239
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54239.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54239
Aliases
  • GHSA-q6pm-r77q-qcv3
Published
2026-09-17T18:25:36Z
Modified
2026-09-20T11:30:20Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
FaustWP — Authentication Bypass via Initialization Vector Modification in Token Envelope
Details

Faust.js is a headless WordPress toolkit. Prior to 1.8.11, the FaustWP WordPress plugin authenticates only the ciphertext in its token envelope and excludes the 16-byte initialization vector from the HMAC in WPE\FaustWP\Auth\encrypt() and WPE\FaustWP\Auth\decrypt() in plugins/faustwp/includes/auth/functions.php. A logged-in non-administrator who obtains an authorization code from GET /generate can modify the unauthenticated initialization vector so that CBC decryption changes the token type and user identifier while the HMAC remains valid. This can produce an access token for an Administrator and permit full WordPress REST API access, administrator-account creation, plugin installation, and arbitrary code execution. This issue is fixed in repository version 1.8.11.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-345",
        "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54239.json"
}
References

Affected packages

Git / github.com/wpengine/faustjs

Affected ranges

Type
GIT
Repo
https://github.com/wpengine/faustjs
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
cda00de7290f9b178cb1652d30b4cdf5bb8688d0
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.11"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

"1.*
"1.7.5"
"1.8.0"
@faustjs/core@0.*
@faustjs/core@0.12.3
@faustjs/core@0.12.4
@faustjs/core@0.13.1
@faustjs/core@0.14.0
@faustjs/core@0.14.1
@faustjs/core@0.15.0
@faustjs/core@0.15.1
@faustjs/core@0.15.10
@faustjs/core@0.15.13
@faustjs/core@0.15.2
@faustjs/core@0.15.4
@faustjs/core@0.15.6
@faustjs/core@0.15.7
@faustjs/next-headless-getting-started@0.*
@faustjs/next-headless-getting-started@0.1.0
@faustjs/next@0.*
@faustjs/next@0.12.2
@faustjs/next@0.12.3
@faustjs/next@0.12.4
@faustjs/next@0.13.0
@faustjs/next@0.13.1
@faustjs/next@0.14.0
@faustjs/next@0.15.0
@faustjs/next@0.15.1
@faustjs/next@0.15.10
@faustjs/next@0.15.11
@faustjs/next@0.15.12
@faustjs/next@0.15.13
@faustjs/next@0.15.14
@faustjs/next@0.15.3
@faustjs/next@0.15.4
@faustjs/next@0.15.5
@faustjs/next@0.15.6
@faustjs/next@0.15.7
@faustjs/next@0.15.8
@faustjs/next@0.15.9
@faustjs/next@0.16.0
@faustjs/react@0.*
@faustjs/react@0.12.4
@faustjs/react@0.13.1
@faustjs/react@0.14.0
@faustjs/react@0.15.0
@faustjs/react@0.15.1
@faustjs/react@0.15.10
@faustjs/react@0.15.13
@faustjs/react@0.15.6
@faustjs/react@0.15.7
@faustjs/react@0.16.0
@faustwp/block-editor-utils@0.*
@faustwp/block-editor-utils@0.0.1
@faustwp/block-editor-utils@0.0.2
@faustwp/block-editor-utils@0.0.3
@faustwp/block-editor-utils@0.0.4
@faustwp/block-editor-utils@0.0.5
@faustwp/block-editor-utils@0.1.0
@faustwp/block-editor-utils@0.2.0
@faustwp/block-editor-utils@0.2.1
@faustwp/block-editor-utils@0.3.0
@faustwp/block-editor-utils@0.3.1
@faustwp/block-editor-utils@0.3.2
@faustwp/block-editor-utils@0.3.3
@faustwp/block-editor-utils@0.3.4
@faustwp/block-editor-utils@0.3.5
@faustwp/block-editor-utils@0.3.6
@faustwp/block-support-example@0.*
@faustwp/block-support-example@0.1.0
@faustwp/block-support-example@0.2.0
@faustwp/blocks@0.*
@faustwp/blocks@0.1.0
@faustwp/blocks@0.1.1
@faustwp/blocks@0.2.0
@faustwp/blocks@0.2.1
@faustwp/blocks@0.3.0
@faustwp/blocks@0.3.1
@faustwp/blocks@1.*
@faustwp/blocks@1.0.0
@faustwp/blocks@1.1.0
@faustwp/blocks@1.2.0
@faustwp/blocks@2.*
@faustwp/blocks@2.0.0
@faustwp/blocks@3.*
@faustwp/blocks@3.0.0
@faustwp/blocks@4.*
@faustwp/blocks@4.0.0
@faustwp/blocks@4.1.0
@faustwp/blocks@5.*
@faustwp/blocks@5.0.0
@faustwp/blocks@6.*
@faustwp/blocks@6.0.0
@faustwp/blocks@6.1.0
@faustwp/blocks@6.1.1
@faustwp/blocks@6.1.2
@faustwp/blocks@6.1.3
@faustwp/blocks@6.1.4
@faustwp/blocks@6.1.5
@faustwp/blocks@6.1.6
@faustwp/cli@0.*
@faustwp/cli@0.1.0
@faustwp/cli@0.1.1
@faustwp/cli@0.1.2
@faustwp/cli@0.1.3
@faustwp/cli@0.1.4
@faustwp/cli@0.1.5
@faustwp/cli@0.1.6
@faustwp/cli@0.2.0
@faustwp/cli@0.2.10
@faustwp/cli@0.2.12
@faustwp/cli@0.2.13
@faustwp/cli@0.2.2
@faustwp/cli@0.2.7
@faustwp/cli@1.*
@faustwp/cli@1.0.0
@faustwp/cli@1.0.1
@faustwp/cli@1.1.1
@faustwp/cli@1.1.3
@faustwp/cli@1.1.4
@faustwp/cli@1.2.0
@faustwp/cli@1.2.1
@faustwp/cli@2.*
@faustwp/cli@2.0.0
@faustwp/cli@3.*
@faustwp/cli@3.0.0
@faustwp/cli@3.0.1
@faustwp/cli@3.0.2
@faustwp/cli@3.1.0
@faustwp/cli@3.1.1
@faustwp/cli@3.2.1
@faustwp/cli@3.2.2
@faustwp/cli@3.2.3
@faustwp/cli@3.2.4
@faustwp/cli@3.2.5
@faustwp/cli@3.3.1
@faustwp/cli@3.3.3
@faustwp/cli@3.3.4
@faustwp/core@0.*
@faustwp/core@0.1.0
@faustwp/core@0.1.1
@faustwp/core@0.1.2
@faustwp/core@0.1.3
@faustwp/core@0.1.5
@faustwp/core@0.2.0
@faustwp/core@0.2.1
@faustwp/core@0.2.10
@faustwp/core@0.2.11
@faustwp/core@0.2.13
@faustwp/core@0.2.2
@faustwp/core@0.2.3
@faustwp/core@0.2.4
@faustwp/core@0.2.5
@faustwp/core@0.2.6
@faustwp/core@0.2.7
@faustwp/core@0.2.8
@faustwp/core@0.2.9
@faustwp/core@1.*
@faustwp/core@1.0.0
@faustwp/core@1.0.1
@faustwp/core@1.0.2
@faustwp/core@1.0.3
@faustwp/core@1.1.0
@faustwp/core@1.1.1
@faustwp/core@1.1.2
@faustwp/core@1.2.0
@faustwp/core@2.*
@faustwp/core@2.0.0
@faustwp/core@2.1.0
@faustwp/core@2.1.1
@faustwp/core@2.1.2
@faustwp/core@3.*
@faustwp/core@3.0.0
@faustwp/core@3.0.1
@faustwp/core@3.0.3
@faustwp/core@3.1.0
@faustwp/core@3.2.0
@faustwp/core@3.2.1
@faustwp/core@3.2.2
@faustwp/core@3.2.3
@faustwp/core@3.2.4
@faustwp/core@3.2.6
@faustwp/core@3.3.0
@faustwp/core@3.3.1
@faustwp/core@3.3.2
@faustwp/core@3.3.4
@faustwp/experimental-app-router@0.*
@faustwp/experimental-app-router@0.0.1
@faustwp/experimental-app-router@0.0.2
@faustwp/experimental-app-router@0.0.3
@faustwp/experimental-app-router@0.0.4
@faustwp/experimental-app-router@0.1.0
@faustwp/experimental-app-router@0.2.0
@faustwp/experimental-app-router@0.2.1
@faustwp/experimental-app-router@0.2.2
@faustwp/experimental-app-router@0.3.0
@faustwp/experimental-app-router@0.3.1
@faustwp/experimental-app-router@0.4.0
@faustwp/experimental-app-router@0.5.0
@faustwp/experimental-app-router@0.6.0
@faustwp/getting-started-example@0.*
@faustwp/getting-started-example@0.1.0
@faustwp/wordpress-plugin@"1.*
@faustwp/wordpress-plugin@"1.8.2"
@faustwp/wordpress-plugin@0.*
@faustwp/wordpress-plugin@0.8.1
@faustwp/wordpress-plugin@0.8.3
@faustwp/wordpress-plugin@0.8.4
@faustwp/wordpress-plugin@0.8.5
@faustwp/wordpress-plugin@0.8.6
@faustwp/wordpress-plugin@0.8.7
@faustwp/wordpress-plugin@1.*
@faustwp/wordpress-plugin@1.0.0
@faustwp/wordpress-plugin@1.0.1
@faustwp/wordpress-plugin@1.0.2
@faustwp/wordpress-plugin@1.0.3
@faustwp/wordpress-plugin@1.0.4
@faustwp/wordpress-plugin@1.1.0
@faustwp/wordpress-plugin@1.1.1
@faustwp/wordpress-plugin@1.1.2
@faustwp/wordpress-plugin@1.2.0
@faustwp/wordpress-plugin@1.2.1
@faustwp/wordpress-plugin@1.2.2
@faustwp/wordpress-plugin@1.2.3
@faustwp/wordpress-plugin@1.3.0
@faustwp/wordpress-plugin@1.3.1
@faustwp/wordpress-plugin@1.3.2
@faustwp/wordpress-plugin@1.4.0
@faustwp/wordpress-plugin@1.4.1
@faustwp/wordpress-plugin@1.5.0
@faustwp/wordpress-plugin@1.6.0
@faustwp/wordpress-plugin@1.7.0
@faustwp/wordpress-plugin@1.7.1
@faustwp/wordpress-plugin@1.7.2
@faustwp/wordpress-plugin@1.7.3
@faustwp/wordpress-plugin@1.7.4
@faustwp/wordpress-plugin@1.7.5
@faustwp/wordpress-plugin@1.8.0
@faustwp/wordpress-plugin@1.8.1
@faustwp/wordpress-plugin@1.8.2
@faustwp/wordpress-plugin@1.8.3
@faustwp/wordpress-plugin@1.8.4
Other
canary
faust-nx-getting-started@0.*
faust-nx-getting-started@0.1.0
faust-nx@0.*
faust-nx@0.0.1
package/core/0.*
package/core/0.11.0
package/headless/0.*
package/headless/0.6.1
package/headless/0.6.2
package/headless/0.6.3
plugin/faustwp/v0.*
plugin/faustwp/v0.7.0
plugin/faustwp/v0.7.1
plugin/faustwp/v0.7.10
plugin/faustwp/v0.7.11
plugin/faustwp/v0.7.3
plugin/faustwp/v0.7.4
plugin/faustwp/v0.7.5
plugin/faustwp/v0.7.6
plugin/faustwp/v0.7.7
plugin/faustwp/v0.7.8
plugin/faustwp/v0.7.9
plugin/faustwp/v0.8.0
plugin/wpe-headless/0.*
plugin/wpe-headless/0.3.2-alpha.1
plugin/wpe-headless/0.4.0
plugin/wpe-headless/0.4.1
plugin/wpe-headless/0.5.0
plugin/wpe-headless/0.5.1
plugin/wpe-headless/0.5.2
plugin/wpe-headless/0.5.3
plugin/wpe-headless/0.5.4
plugin/wpe-headless/0.5.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54239.json"