EUVD-2026-93496
GHSA-7c65-c88q-5jx5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network request bypasses authorization (PR:N/AV:N/AC:L), yielding code execution as web-server user with full C/I/A impact; scope unchanged as impact stays within the application.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
The Crayons plugin for SPIP before 3.5.0 contains a missing authorization vulnerability that allows unauthenticated attackers to modify arbitrary editable object fields by omitting the secu_ anti-forgery parameter in crayons_store.php, causing the authorization dispatcher to resolve an unconditionally-true handler instead of the proper modification check. Attackers can chain this flaw to write a malicious .html skeleton file, disclose sensitive configuration files containing the site secret, and forge a signed ajax context to execute the uploaded skeleton, achieving arbitrary PHP code execution as the web-server user.
Articles & Coverage 2
AnalysisAI
Unauthenticated remote code execution in the SPIP Crayons plugin before 3.5.0 allows any remote attacker to take over a SPIP site by reaching crayons_store.php without the secu_ anti-forgery parameter, which causes the authorization dispatcher to select an unconditionally-true handler instead of the legitimate modification check. With authorization bypassed, the attacker can write an arbitrary .html skeleton file, read configuration files that expose the site secret, and forge a signed AJAX context that executes the planted skeleton as PHP under the web-server user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitable only where the SPIP Crayons plugin is installed and enabled at a version before 3.5.0; the trigger is a request to crayons_store.php with the secu_ anti-forgery parameter omitted, which makes the authorization dispatcher select an unconditionally-true handler. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, not a high-CVSS-but-low-risk paper finding. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: Crayons 3.5.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SPIP installations and identify any with the Crayons plugin enabled below 3.5.0, then apply the vendor-released patch: 3.5.0 (or later) immediately; if patching cannot be completed, disable or remove the Crayons plugin and restrict access to crayons_store.php at the web server or WAF. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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