CVE-2026-77806Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via injected template filters

Published Aug 21, 2026 · Updated Aug 21, 2026

Code injection in SPIP before 4.4.21 allows remote attackers to execute arbitrary code through a crafted X-Spip-Filtre header. In forum preview processing, analyse_resultat_skel() extracts attacker-controlled filter names from the compiled template body and invokes them as PHP functions. No authentication or user interaction is required, and the demonstrated intval|_request|system chain executes an attacker-supplied command under the web server account.

CVSS severity9.8
Critical
EPSS probability4.20%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in SPIP before 4.4.21 allows remote attackers to execute arbitrary code through a crafted X-Spip-Filtre header. In forum preview processing, analyse_resultat_skel() extracts attacker-controlled filter names from the compiled template body and invokes them as PHP functions. No authentication or user interaction is required, and the demonstrated intval|_request|system chain executes an attacker-supplied command under the web server account.

The record

CVE
CVE-2026-77806
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
SPIP
Product
SPIP
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.4.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SPIP · SPIPversion=0 <4.4.21

Published CVSS scores

9.8MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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