EUVD-2026-76155
GHSA-px65-33x4-mwqq
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
Remote, unauthenticated, low-complexity request resets any admin password with no user interaction, yielding full account takeover and thus high confidentiality, integrity, and availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
SPIP before 4.4.18 contains a missing authorization vulnerability in the administrative action endpoints under ecrire/action/ that allows unauthenticated attackers to perform privileged actions by supplying a valid HMAC-SHA256 nonce without any server-side permission check via autoriser(). Attackers can obtain a valid nonce, compute it for any action as the anonymous user, and invoke the editer_auteur action directly over HTTP to reset the password of any user account, including the administrator.
AnalysisAI
Full account takeover in SPIP before 4.4.18 lets unauthenticated attackers reset the password of any user - including administrators - by invoking the editer_auteur administrative action directly over HTTP. The administrative action endpoints under ecrire/action/ accept a valid HMAC-SHA256 nonce as sufficient proof of authorization but never call autoriser() to verify server-side permissions, so an anonymous user can compute a valid nonce for any action. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against default configurations of SPIP versions before 4.4.18; the vulnerable ecrire/action/ endpoints are part of the standard installation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not an inflated CVSS. … 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 | Upgrade to SPIP 4.4.18, which contains the vendor fix that restores server-side autoriser() permission checks on the ecrire/action/ handlers (Vendor-released patch: 4.4.18; see https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-18.html). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SPIP installations and immediately isolate any systems running versions before 4.4.18 from internet access, as publicly available exploit code exists for this vulnerability. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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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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